3-D Home Kit, Feb 1993, 176
3D Images, May 1992, 391
46 Template Triangles, Dec 1987, 755
4D Graphics Lab, May 1989, 392-393
About the Cover, Oct 1998, 547
An Abundance of Solutions, May 1992, 384-387
AcroSpin & Geometry Files, Mar 1994, 212
An Active Approach to Geometry, Dec 1994, 702-703
Activities: A Geometric Look at Greatest Common Divisor, Mar 1991, 202-208
Activities: Area and Perimeter Connections, Mar 1993, 218-21, 231-2
Activities: Cube Challenge, May 1993, 386-90, 395-8
Activities: Determining Area and Calculating Cost: A Model Application, May 1992, 360-1, 367-70
Activities: Discovery with Cubes, May 1988, 377-381
Activities: Exploring Three- and Four-Dimensional Space, Oct 1995, 572-8, 588-90
Activities: Geometric Transformations-Part 1, Mar 1994, 177-81, 187-9
Activities: Geometric Transformations-Part 2, Apr 1994, 258-61, 268-70
Activities: Golden Triangles, Pentagons, and Pentagrams, May 1994, 338-44, 350-3
Activities: If Pythagoras Had a Geoboard, Feb 1993, 137-40, 145-8
Activities: Inductive and Deductive Reasoning, May 1990, 378-384
Activities: Interesting Area Ratios within a Triangle, Nov 1989, 630-636
Activities: Line and Rotational Symmetry, Apr 1991, 296-302
Activities: Mathematical Connections with a Spirograph, Feb 1992, 129-137
Activities: Metes and Bounds Descriptions: An Application of Geometry and Measurement, Sep 1990, 462-468
Activities: Perimeters, Patterns, and Conjectures, Feb 1994, 98-101, 107-8
Activities: Playing with Blocks: Visualizing Functions, Nov 1992, 641-6, 652-4
Activities: Polygons Made to Order, Jan 1987, 44-50
Activities: Preparing for Pythagoras, Apr 1989, 271-275
Activities: Problem Solving with Cubes, Sep 1992, 447-50, 458-60
Activities: Puzzles That Section Regular Solids, Sep 1988, 463-468
Activities: Pythagorean Dissection Puzzles, Apr 1993, 302-8, 313-4
Activities: Recursion and the Central Polygonal Numbers, Dec 1991, 738-746
Activities: Some Discoveries with Right-Rectangular Prisms, Feb 1989, 118-123
Activities: Starring in Mathematics, Sep 1991, 463-470
Activities: The Functions of a Toy Balloon, Nov 1994, 619-22, 628-9
Activities: The Toothpick Problem and Beyond, Oct 1992, 543-5, 555-6
Activities: Through the Looking Glass with Planes, Points, and Rotational Symmetry, May 1987, 377-388
Activities: Understanding Angles: Wedges to Degrees, Apr 1990, 294-300
Advanced Geometric Constructions, Oct 1988, 595
The Adventures of Archibald Higgins: Here's Looking at Euclid, Apr 1987, 318
Albrecht Dürer's Renaissance Connections between Mathematics and Art, Apr 1994, 278-282
Alex: A One-Act Play about Euclid, Apr 1986, 303
Algebra and Tiling: Homomorphisms in the Service of Geometry, Dec 1995, 778
Algebra and Trigonometry with Analytic Geometry, Jan 1988, 73
Algebra and Trigonometry with Analytic Geometry, 7th ed, Feb 1990, 160-162
Algebra in the Service of Geometry: Can Euler's Line Be Parallel to a Side of a Triangle? May 2000, 428–31
The Amazing Octacube. Feb. 1999, 102-4
An Alternative Perspective on the Optical Property of Ellipses, Nov 1986, 656-657
Analytic Geometry, 2d ed, Feb 1992, 146
Analyzing Teaching and Learning: The Art of Listening, Apr 1996, 326–29
Angle Hunt, Apr 1990, 282-283
The Angles of a Star. Sept. 2000, 512–16
Animating Geometry Discussions with Flexigons, Nov 1994, 602-606
Another Approach to the Ambiguous Case, Mar 1987, 208-209
An Application of Affine Geometry, Jan 1989, 28-32
An Application of the Criteria ASASA for Quadrilaterals, Feb 1988, 124-126
Applications: Mathematics of the Rainbow, Sep 1988, 484-488
Applications of Conic Sections: The Eccentric Professor, Oct 1995, 614
Applications: Two Geometry Applications, Nov 1990, 655-658
Applying the Midpoint Theorem, Apr 1988, 274
Approaching Precalculus Mathematics Discretely: Explorations in a Computer Environment, Oct 1991, 571-572
Archimedean and Archimedean Dual Polyhedra, Oct 1991, 576
Archimedes and Pi, Mar 1989, 204-206
Archimedes' Pi-An Introduction to Iteration, Mar 1988, 208-210
Area and Perimeter are Independent, Jan 1991, 33-35
Area Formulas on Isometric Dot Paper, May 1989, 366-369
Area of a Triangle, Feb 1990, 120
Area of Spherical Triangles. Feb. 1999, 150-53
Area Ratios of Quadrilaterals, Mar 1989, 176-184
Areas and Perimeters of Geoboard Polygons, May 1990, 392-398
The Art of Renaissance Science: Galileo and Perspective, Sep 1992, 496
The Artist's View of Points and Lines, Feb 1991, 133-138
Assessing Justification and Proof in Geometry Classes Taught Using Dynamic Software, Jan 1998, 76–82
Ballooning, Gr. 8-12, Mar 1995, 242
The Bank Shot, Sep 1986, 429-430, 487
Beetles, Moths, and Bumblebees; Squids and Rays, Nov 1995, 688
Beginning Geometry, Dec 1990, 748
Benoit Mandelbrot: The Euclid of Fractal Geometry. Nov. 2000, 708–12
Bent Wire-An Application of Quadratic Equations and Inequalities, Jan 1986, 57-58
Beyond the Third Dimension: Geometry, Computer Graphics, and Higher Dimensions, Apr 1991, 325
The Big Picture, Apr 1990, 258-262
The Binomial Grid, May 1986, 337-339
A Book of Creative Geometry. Dec. 1999, 800-801
Bringing Pythagoras to Life, Dec 1995, 744-747
The Bug on the Box, Sep 1992, 474-475
Build a Sierpinski Pyramid. May 1999, 384-86
Build Your Own Polyhedra, Feb 1989, 145
Build Your Own Polyhedra, Oct 1994, 572
Building Foundations, Sep 1995, 528
Building Fractal Models with Manipulatives, Nov 1993, 646-651
Building Thinking Skills-Book 3, Figural, Mar 1989, 224
Calculating Surface Area, May 1991, 367-369
Calculus and Analytic Geometry, Feb 1988, 152
Calculus and Analytic Geometry, Nov 1988, 688-690
Calculus with Analytic Geometry, Sep 1987, 493-494
Calculus with Analytic Geometry, 3d ed, Oct 1986, 564
Calculus with Analytic Geometry, 3d ed, Dec 1988, 755
Calculus and Analytic Geometry, 3d ed, Dec 1990, 750
Calculus with Analytic Geometry, 3d ed, Nov 1990, 680-681
Calculus with Analytic Geometry, 4th ed, Dec 1990, 750-752
The Calculus with Analytic Geometry, 5th ed, Feb 1987, 162
Calculus with Analytic Geometry, Late Trigonometric Version, 3d ed, Feb 1990, 162
The Case for Chaos, Apr 1998, 276–81 (see also Nov 1998, 713)
Casey's Compass, Feb 1990, 167
The Cevian Problem, May 1998, 388–92
A Chain of Influence in the Development of Geometry, Jan 1991, 15-18
Challenging Problems in Geometry, Sep 1987, 498
Chaos and Fractals, Oct 1990, 524-529
Chaos under Control: The Art and Science of Complexity, Feb 1995, 150
Chipping Away at Proofs: A Cooperative Approach. Oct. 1999, 565-67
The Circle and Sphere as Great Equalizers, Nov 1991, 666-672
Circles Revisited, Oct 1992, 573-577
The Circular Geoboard, Nov 1991, 680
College Preparatory Mathematics: Change from Within, Nov 1995, 660-666
Communicating Mathematics, Nov 1991, 615-622
Complex Numbers and Geometry, Dec 1994, 720
Concepts in Mathematics: Conic Sections, Dec 1992, 767-768
Concepts in Mathematics: Trigonometric Functions 1: Solving Triangles, Dec 1992, 768
Conic Sections: Slicing the Cone, Oct 1993, 615
The Conic Sections in Taxicab Geometry: Some Investigations for High School Students, Apr 1998, 304–10, 316–17, 341
Conics Model, Sep 1995, 528
Conjectures in Geometry and the Geometer's Sketchpad, Sep 1995, 456-458
Connecting Geometry and Algebra: Geometric Interpretations of Distance, Apr 1995, 292-97 See also Dec 1995, 785
Connecting Research to Teaching: Geometry and Proof, Jan 1995, 48-54
Connecting Research to Teaching: Guidelines for Teaching Plane Isometries in Secondary School, Oct 1995, 591-597
Conquering Mathematics from Arithmetic to Calculus, Feb 1992, 146-148
Constructing Ellipses, Mar 1988, 188-190
Constructions with Obstructions Involving Arcs, May 1993, 360-363
A Constructive Proof of a Common Inequality, Oct 1989, 531-532
The Contributions of Karaji-Successor to al-Khwarizmi, Oct 1986, 538-541
The Converse of the Pythagorean Theorem, Dec 1994, 692-693
Coordinate Geometry: A Powerful Tool for Solving Problems, Apr 1990, 264-268
A Core Curriculum in Geometry, Apr 1992, 300-303
Counting Squares, Dec 1991, 754-758
Creating Miracles: A Study of Student Discovery, Jan 1995, 60-61
Creating a Learning Environment for Geometric Reasoning, Oct 1997, 521–26, 542
Creative Teaching Will Produce Creative Students, Sep 1994, 415-418
Cube Builder: A 3-D Geometry Tool, Dec 1987, 748
Curriculum and Evaluation Standards for School Mathematics: Geometry from Multiple Perspectives, Apr 1993, 345
Descriptive-Paragraph Miniproject, May 1997, 362–63
Designing Dreams in Mathematics, Nov 1989, 620-621
Developmental Mathematics, 4th ed, Dec 1990, 752
Developmental Mathematics: Arithmetic, Algebra, and Measurement Geometry, May 1988, 403
Did Gauss Discover That, Too?, Apr 1986, 288-293
Did the Scarecrow Really Get a Brain?, Sep 1986, 438-439
A Different Approach to Teaching the Midpoint Formula, May 1989, 344-345
A Direct Derivation of the Equations of the Conic sections, Mar 1990 190-193
Dirichlet Polygons-An Example of Geometry in Geography, Mar 1986, 170-173
Discoveries with Rectangles and Rectangular Solids, Apr 1987, 274-276
Discovering a Geometric Volume Relationship in Calculus, Apr 1998, 334–36
Discovering Geometry: An Inductive Approach, Feb 1990, 162-164
Discovering Geometry: An Inductive Approach, Sep 1990, 482
Discovering Optimum Networks in Triangles. Sept. 1999, 534-39.
Dissecting a Chord by Chords through n Points, Apr 1991, 318-319
Distance from a Point to a Line, Dec 1986, 710-711
Dodecagon of Fortune, Dec 1988, 734-735
Drilling Square Holes, Oct 1993, 579-583
Dropping Perpendiculars the Easy Way, Jan 1987, 30-31
Dynamic Geometry Environments: What's the Point?, Dec 1994, 716-717
Elementary Geometry, Dec 1991, 765-766
Elementary Plane Geometry, 2d ed, Mar 1986, 223
Episodes in Nineteenth and Twentieth Century Euclidean Geometry, Nov 1995, 686
Equilateral Triangles on an Isometric Grid, Dec 1990, 740-743
Estimating Pi by Microcomputer, Mar 1988, 203-206, 226
Euclid, Oct 1986, 559-560
Euclid and Descartes: A Partnership, Dec 1991, 706-709
Euclid, Fibonacci, Sketchpad, Jan 1997, 8–12 (see also Sep 1997, 480–81, 484 and Oct 1997, 566, 568)
Euclid's Toolbox-Triangles, Sep 1991, 484
Euclides Vindicatus, Mar 1987, 254
The Euler Line and Nine-Point-Circle Theorems. Jan. 1999, 50-54 (see also Oct. 1999, 629)
Evaluating Mathematics Videotapes for Use in the Classroom, Apr 1998, 348–53, 359
Evaluation of Empowerment in a High School Geometry Class, Dec 1997, 738–41
Exhibiting Connections between Algebra and Geometry, Dec 1991, 703-705
Experiencing Radians. Sept. 1999, 468-71
Explorations in Geometry: The "Art" of Mathematics, May 1997 340–42 (see also Dec 1997, 766–67)
Exploratory Geometry-Let the Student Write the Text, Sep 1994, 403-48
Exploring Chaos, Feb 1994, 127
Exploring Fractals in the Classroom. Apr. 1999, 360-66 (see also Sept. 1999, 524).
Exploring Fractals-A Problem-Solving Adventure Using Mathematics and Logo, Mar 1990, 179-185, 244
Exploring Geometry with The Geometer's Sketchpad, Dec 1994, 724
Exploring Hyperbolic Geometry with The Geometer's Sketchpad. Oct. 1999, 632-37
Exploring Knots, Nov 1997, 640–46, 652
Exploring Three- and Four-Dimensional Space, Oct 1995, 572-78, 588-90
Faculty Advancement in Mathematics (FAIM): Geometry, Modeling & Statistics, Jan 1995, 61
Finding Buried Treasures--an Application of The Geometer's Sketchpad, Feb 1998, 162–65
Finding the Area of Regular Polygons, Apr 1987, 278-280
Finger Math in Geometry. Apr. 2000, 266–68
Five-Minute Challenges for Secondary School: Mini Problem-Solving Activities, Feb 1989, 147
Folded Paper, Dynamic Geometry, and Proof: A Three-Tier Approach to the Conics, Mar 1996, 188–93
Folding n-Pointed Stars and Snowflakes, Nov 1994, 630-637
Formulas and Sugar Cubes, Feb 1990, 119-120
Foundations and Fundamental Concepts of Mathematics, 3d ed, Dec 1990, 752
Fractal Cosmos 1990 Calendar, Dec 1989, 737
A Fractal Excursion, Apr 1991, 265-275
Fractals, Mar 1990, 238
Fractals: An Animated Discussion, Oct 1991, 576-578
Fractals and Transformations, Mar 1991, 178-185
Fractals for the Classroom: Strategic Activities, Vol. 1, Feb 1992, 146
Fractals for the Classroom: Strategic Activities, Vol. 2, Feb 1993, 171
Fractals in High School: Exploring a New Geometry. Mar. 1999, 260-69 (see also Sept. 1999, 524)
From Drawing to Construction with The Geometer's Sketchpad, May 1995, 428-31
Games, Geometry and Teaching, Apr 1988, 250-259
Gary O's Fence Question, Mar 1993, 252-254
Gateway to Geometry, Sep 1995, 530
Gathering Circles: An Experience in Creativity and Variety. Dec. 2000, 746–52
The Generality of a Simple Area Formula, Dec 1993, 738-740
A Generalized Area Formula, Dec 1992, 752-754
Generating Fractals through Self-Replication, Jan 1997, 34–38, 43–45 (see also Sep 1997, 484)
Geo-Pool and Geo-Billiards Activities for Geometry, Sep 1987, 490-491
Geoboard Quadrilaterals, Apr 1998, 288–90
GeoExplorer: A Geometry Drawing Tool, Oct 1992, 587
Geographic Constructions, Mar 1992, 184-187
The Geometer's Sketchpad, May 1992, 392-393
A Geometric Approach to the Discriminant, Apr 1995, 323-25
Geometric Concepts in Islamic Art, Oct 1988, 596
Geometric Connectors: Coordinates, Feb 1993, 169
Geometric Connectors: Transformations, Dec 1992, 761
Geometric Constructions Using Hinged Mirrors, May 1986, 380-386
Geometric Constructions: Visualizing and Understanding Geometry, Oct 1998, 554–56
Geometric Design: Step by Step, Oct 1988, 596
Geometric Etudes in Combinatorial Mathematics, Feb 1992, 148
A Geometric Figure Relating the Golden Ratio and Pi, May 1986, 340-341
The Geometric Golfer, Oct 1993, 610
Geometric Patterns for Exponents, Dec 1992, 746-749
Geometric Probability, Oct 1991, 570
A Geometric Proof of the Sum-Product Identities for Trigonometric Functions, Mar 1987, 240-244
A Geometric Puzzle That Leads to Fibonacci Sequences, Jan 1998, 21–23 (see also Nov 1998, 713)
A Geometric Solution to a Problem of Minimization, Jan 1988, 61-64
The Geometric superSupposer, Feb 1994, 127-128
The Geometric Supposer: Promoting Thinking and Learning, Sep 1986, 418-422
The Geometric Supposer: Quadrilaterals, Oct 1986, 560
The Geometric Supposer: Triangles, Oct 1986, 560-561
The Geometric Supposer: What Is Is a Case Of?, Nov 1993, 692-693
Geometrical Adventures in Functionland, May 1987, 346-352
A Geometrical Approach to the Six Trigonometric Ratios, Sep 1993, 496-498
Geometrical Inequalities via Bisectors, Feb 1989, 96-99
A Geometrical Representation of Primitive Pythagorean Triples, May 350–54 (see also Dec 1997, 766)
Geometry, Oct 1987, 592
Geometry, Jan 1992, 73-74
Geometry 1 & 2, Sep 1990, 472
Geometry, 2d ed, Sep 1987, 494
Geometry: An Informal Approach, May 1987, 409-410
Geometry: An Integrated Approach, Apr 1995, 354
Geometry and Proof, Jan 1995, 48-54
Geometry and Microcomputers, Sep 1988, 493
Geometry and Poetry, Feb 1994, 88
Geometry around Us: Geometry by Design and Geometry by Nature, Feb 1994, 133-134
Geometry: Axiomatic Developments with Problem Solving, Dec 1994, 721
Geometry Classroom Pictures: What's Developing? Oct 1998, 606–9
Geometry: Concepts and Proofs, Sep 1990, 471
Geometry for Enjoyment and Challenge, rev. ed, Sep 1991, 488-489
Geometry for Grades K-6: Readings from the Arithmetic Teacher, Dec 1987, 748-749
Geometry in English Wheat Fields, Dec 1995, 802
Geometry in Mangbetu Design, May 1998, 376–81
Geometry: New Tools for New Technologies, Sep 1993, 506-507
Geometry Plane and Simple, Mar 1990, 240
The Geometry Problem Solver: A Complete Solution Guide to Any Textbook, Feb 1994, 131-132
Geometry Problems Promoting Reasoning and Understanding. Feb. 1999, 114-16
The Geometry Proof Tutor: An Intelligent Computer-Based Tutor in the Classroom, Apr 1990, 308-317
Geometry Proof Writing: A Problem-Solving Approach à la Pólya, Oct 1995, 552-555
A Geometry Solution from Multiple Perspectives. Apr. 2000, 324–27
Geometry Study Series: Area and Volume, Feb 1988, 150
Geometry, teacher's ed, Oct 1992, 590
Geometry Volume 1: Basic Geometrical Notions, Sep 1986, 477
Geometry with Logo, Apr 1986, 301
Geometry's Giant Leap. Dec. 1999, 816-19
The Golden Relationship: Art, Math and Nature, Feb 1988, 154
Graphing a Solid: A Classroom Activity, Dec 1993, 734-737
A Graphing Matter: Activities for Easing into Algebra, Sep 1995, 530
Great Ideas for Teaching MATH, Apr 1991, 326
Group Symmetries Connect Art and History with Mathematics. May 2000, 364–70
Guessing Geometric Shapes, Mar 1987, 178-180
Guidelines for Teaching Plane Isometries in Secondary School, Oct 1995, 591-97
GyroGraphics, version 2.2, Mar 1991, 235
Halley's Comet in the Classroom, Feb 1986, 85-89
Helaman Ferguson: Mathematics in Stone and Bronze, Oct 1995, 608
Helping Students Write Paragraph Proofs in Geometry, Oct 1994, 498-502
Heron's Remarkable Triangle Area Formula, Feb 1993, 161-163
Hidden Treasures in Students' Assumptions, Oct 1993, 567-569
HiMAP: Module 11, Applications of Geometrical Probability, Apr 1990, 331
HiMAP: Module 12, Spheres and Satellites, Apr 1990, 331-332
HiMAP: Module 13, The Mathematicians Coloring Book, Apr 1990, 332
History of Pi, Mar 1991, 238-240
Holt Geometry, Mar 1986, 224-225
How Amazing, Mar 1994, 212
How Does One Cut a Triangle?, Jan 1991, 68
How Rough Is Your State?, Mar 1995, 188-190
How to Enrich Geometry Using String Designs, Mar 1987, 253
How to Teach Perimeter, Area and Volume, Sep 1987, 492-493
How to Use Conjecturing and Microcomputers to Teach Geometry, Sep 1990, 480-481
Hypergeo: A Program for Investigating the Geometrical Properties of Four-Dimensional Space, Sep 1994, 453
IFS Explorer, Sep 1991, 486
Illustrating Mathematical Connections: A Geometric Proof of Euler's Theorem, Jan 1996, 62–65
Illustrating Mathematical Connections: Two Proofs That Only Five Regular Polyhedra Exist, Nov 1993, 657-661
Illustrating the Euler Line, May 1987, 389-393
Images of Geometric Solids, Oct 1986, 565
Implementing the Standards: Ladders and Saws, Sep 1993, 510-513
Implementing the Standards: Making Connections by Using Molecular Models in Geometry, Jan 1994, 43-47
Implementing the Standards: Multiple Approaches to Geometry: Teaching Similarity, Apr 1990, 274-280
Implementing the Standards: Students' Microcomputer-Aided Exploration in Geometry, Nov 1990, 628-635
Improving Students' Understanding of Geometric Definition, Mar 1991 192-194
In Eves' Circles, Dec 1994, 721
In Search of Perfect Triangles. Jan. 1999, 56-61 (see also Oct. 1999, 611, 626)
The Incredible Shrinking Can: Mathematics of Diminishing Returns Revealed, Nov 1993, 642-645
The Incredible Three-by-Five Card!, Feb 1996, 96–98 (see also Oct 1996, 576)
The Indirect Method, Jan 1987, 41-43
Indirect Proof: The Tomato Story, Apr 1989, 260
Informal Geometry, Apr 1993, 348
Informal Geometry Explorations: An Activity-Based Approach, Mar 1993, 265
Inscribing and Approximate Nonagon in a Circle, May 1991, 396-398
Integer-Sided Triangles and the SSA Ambiguity, Oct 1987, 580-584
Integrated Mathematics Course 1, Dec 1991, 768
Integrated Mathematics Course 2, Dec 1991, 768
Integrated Mathematics, Course 2, Teacher's Ed, Feb 1992, 148
Integrating Mathematical Strands, Oct 1997, 516–19
Integrating Spreadsheets into the Mathematics Classroom, Nov 1988, 615-622
Integrating Transformation Geometry into Traditional High School Geometry, Dec 1992, 716-719
Interactive Technology and Classic Geometry Problems, Mar 1998, 204–8
Interdimensional Relationships, Feb 1988, 96-100
An Interesting Solid, May 1986, 378-379
Interpreting and Applying the Distance Formula, Oct 1987, 572-575, 579
Introduction to Geometry, 2d ed, Jan 1990, 73
Introduction to Line Designs, Jan 1993, 90-91
Introduction to Tessellations & Tessellation Teaching Masters, Sep 1990, 482
An Introduction to the Pythagorean Theorem, Nov 1994, 654
Introductory Geometries, Sep 1987, 494-495
Introductory Geometry: A Brief Course with Reasoning Skills, Dec 1990, 753
Inversions, Feb 1991, 142
Investigating Circles and Spirals with a Graphing Calculator, Apr 1994, 240-243
Investigating Polygonal Areas: Making Conjectures and Proving Theorems, Feb 1998, 135–42, 148–50
Investigating Three-Dimensional Geometry, Apr 1995, 346
Is This a Mathematics Class?, Nov 1995, 632-638
The Isoperimetric Problem Revisited, Mar 1993, 207-210
Isoperimetric Quadrilaterals: Mathematical Reasoning with Technology. Feb. 2000, 144–47
Japanese Mathematics, Grades 7, 8 & 9, Oct 1993, 614
Jigsaw Proofs, Mar 1989, 186-187
Journey into Geometries, Nov 1992, 690
Keeping Current with Technology, Feb 1991, 92-96
Knot Theory: The Carus Mathematical Monographs, Sep 1994, 458
Koyn Fractal Designer, Oct 1993, 610-611
Kwakiutl String Figures, Oct 1993, 614
A Lab Approach for Teaching Basic Geometry, Oct 1986, 523-524
Landscape of Geometry: Cracking Up, Oct 1993, 615
Largest Quadrilaterals, Dec 1992, 750-751
Learning and Teaching Geometry, K-12: 1987 Yearbook, Nov 1987, 683
Learning Mathematics and Logo, Apr 1995, 348
Let ABC Be Any Triangle, Nov 1988, 640-642
Let the Computer Draw the Tessellations That You Design, Feb 1988, 138-141
Line Design Poster Sets, Apr 1993, 350-351
Linear Measurement versus Square Measurement; or, Why the Queen Used Two Pi R, Jan 1988, 51-53
Locus of Triangle Vertices, Sep 1998, 474–76
Logo and Mathematics, Nov 1991, 678-679
Logo and the Closed-Path Theorem, Apr 1986, 250-255
A Logo-Based Geometry Curriculum, Feb 1988, 156
Looking at Sk and Sk2 Geometrically, Oct 1993, 584-587
The Lost Trigonometry Class and the Hidden Treasure, Jan 1994 19-22
Luminous Lines: Metamorphosing Light Forms, Sep 1991, 498
M! Project Mathematics! Similarity, Sep 1992, 496
Making Connections: Spatial Skills and Engineering Drawings, Apr 1996, 348–57
Making Shapes series, May 1993, 431-432
Mandelbrot Magic #1, Feb 1990, 157
Maneuvers With Angles, Apr 1993, 351
Maneuvers With Rectangles, Apr 1993, 351
Maneuvers With Triangles, Apr 1993, 351
A Map-Coloring Algorithm, Dec 1991, 759-763
The Master Revealed-A Journey with Tangrams, Sep 1991, 489
Match Geometric Figures with Trigonometric Identities, Jan 1995, 24-25
Math and Music: Harmonious Connections.; Symmetry in Fractals; Symmetry in Wheels, Feb 1995, 152-154
Math and the Mind's Eye, Feb 1992, 158
Math of Arabia, Feb 1995, 154
Math of Europe, Feb 1995, 154
Math of India, Dec 1994, 725
Math of the Navajo, Dec 1994, 725
Math to Build On: A Book for Those Who Build, Apr 1994, 296
Mathematical Investigations: A Series of Situational Lessons, Book One, Apr 1991, 326
Mathematical Thinking in a Quantitative World, Sep 1993, 502-503
Mathematics, a Practical Odyssey, Sep 1993, 503
The Mathematics Achievement Product, Oct 1992, 587-588
Mathematics Applied: An Introduction to Mathematical Modeling, Oct 1991, 573
Mathematics for Welding Trades, Sep 1987, 496
Mathematics in Baseball, Apr 1993, 336-342
Mathematics in Weighting, May 1992, 388-390
Mathematics Meets Technology, Nov 1992, 692
The Mathematics of the Global Positioning System, Sep 1997, 455–62, 469–70
Mathematics: Solving Story Problems: Whole Numbers, Fractions, Decimals, and Geometry Miscellaneous, Oct 1986, 561-562
MathLab: Special Topics, Sep 1990, 475-476
Mathographics, Jan 1992, 74-75
A Matrix Method for Generating Pythagorean Triples, Feb 1987, 103-108
A Matter of Disks, Feb 1986, 96-97, 146
A Mean Solution to an Old Circle Standard, May 1996, 411–13 (see also Dec 1996, 711)
Median of a Trapezoid, Feb 1986, 103-104
Merrill Geometry, Sep 1988, 495
The Method of Archimedes, Mar 1993, 240-243
Microcomputer-Assisted Mathematics: Lessons Learned While Approximating Pi, Feb 1987, 154-159
Mind Sights, Sep 1995, 524
Models of Psychological Space, Feb 1989, 148
Modern Geometries, 4th ed, Sep 1994, 458
Modern Geometries, Third Edition, Nov 1988, 693
A Monte Carlo Application to Approximate Pi, May 1991, 387-390
More Digits for Pi, Sep 1988, 480
More Functions of a Toy Balloon, Apr 1997, 290–94, 300–2
Morgan's Theorem, May 1996, 420–23
Multiple Solutions Involving Geoboard Problems, Jan 1993, 25-29
Napoleon's Waterloo Wasn't Mathematics, Nov 1989, 648-654
The Nature of Mathematics, 6th ed, Feb 1992, 152-154
The Navigator in the Classroom, May 1998, 384–87
Nearly Isosceles Pythagorean Triples-Once More, Dec 1986, 724-725
Nearly Nice Right Triangles, Apr 1989, 296-298
Nested Platonic Solids: A Class Project in Solid Geometry, May 1994, 312-318
Network Neighbors, Sep 1995, 475-477
The New Ambidextrous Universe, Mar 1991, 238
A New Angle on Stars, Nov 1997, 634–39
A New Chapter for Pythagorean Triples, Feb 1991, 144
A New Look at Circles, Feb 1989, 90-93
Nonperiodic Tilings: The Irrational Numbers of the Tiling World. Jan. 1999, 34-40, 46-48
Not Just Any Three Points!, Sep 1989, 436-437
Not Knot, Feb 1994, 134
The Oak Leaf: Connecting Geometry and Biology. Apr. 1999, 294-98
Octagons at Monticello, Jan 1990, 58-61
Old and New Unsolved Problems in Plane Geometry and Number Theory, Sep 1992, 493
One Good Problem Leads to Another and Another and ..., Mar 1997, 188–91 (see also Oct 1997, 568)
Packing Them In, Mar 1997, 211–14, 220–22
Patterns and Puzzles for Pyramids and Prisms, May 1997 370–74, 380–84
Patty Paper Geometry, Oct 1994, 576
The Peelle Triangle, Jan 1987, 56-60
The Pentagon Problem: Geometric Reasoning with Technology, Feb 1996, 86–90
Pentagrams and Spirals, Nov 1996, 680–87
Perfect and Not-So-Perfect Rollers, Jan 1998, 12–20
Perimeter, Area and Volume, Dec 1986, 738
Perimeters, Patterns, and Pi, Apr 1996, 284–88
Perspective, Apr 1994, 296
Perspective Drawing with The Geometer's Sketchpad, Dec 1994, 725
Physical Modeling of Basic Loci, Mar 1993, 216
Pi Day, Feb 1994, 86-87
Pick's Theorem Extended and Generalized, May 1991, 399-401
Picture Play Leads to Algebraic Patterns, May 1993, 382-383`
Pixy Stix Segments and the Midpoint Connection, Nov 1993, 668-675
Place Your Geometry Class in Geopardy, Dec 1987, 722-725
Plane Geometry: Angles of a Circle, Feb 1990, 157-158
Plane Geometry: Coordinate Geometry, Feb 1990, 158-159
Plane Geometry: Proportions in Geometry, Sep 1990, 478
Plane Geometry: Trigonometry of a Right Triangle, Feb 1990, 159
The Platonic Solids Activity Book, Manipulative Kit & Videocassette, Apr 1994, 298
Polymer Geometry, May 1989, 391
Polyominoes: A Guide to Puzzles and Problems in Tiling, Sep 1992, 493-494
Posing Questions from Proposed Problems: Using Technology to Enhance Mathematical Problem Solving. Oct. 2000, 578–80
Practical Geometry Problems: The Case of the Ritzville Pyramids, Mar 1993 198-200
Pre-Algebra: A Transition to Algebra, teacher's ed, Oct 1992, 592
Precalculus: A Problems-Oriented Approach, 3d ed, Oct 1991, 574
Precalculus Mathematics: A Functional Approach, 3d ed, Jan 1987, 75
Primitive Living Structures: Tents and Tipis. Dec. 2000, 738–44
Primitive Quadruples for the Law of Cosines, Apr 1988, 306-308
Problem Posing in Geometry, Jan 1991, 10-14
Problem Solving Also Raises Questions, Dec 1988, 729-732
Problem Solving in Geometry-A Sequence of Reuleaux Triangles, Jan 1986, 11-14
Problem Solving on Geoboards, Jan 1993, 82
Problem Solving Series, vols. 1-5, Sep 1991, 492-493
Products, 1995, 354, 528, 530, 688
Products, 1996, 175, 518, 520–21, 783
Products, 1997, 252, 413, 502, 503
Products, 1998, 90–91
Products, Mar. 1999, 276, Apr. 1999, 372, 376, Oct. 1999, 642.
Project MATHEMATICS! Program Guide and Workbook to accompany the videotape on The Story of Pi, Apr 1991, 334
Projects, 1996, 612–14, 786–87
Projects, 1997, 74, 254–55
Proof in Modern Geometry, Nov 1998, 718–20
The Proof Is in the Puzzle, Sep 1988, 456-457
Proofs without Words: Exercises in Visual Thinking, Nov 1994, 655
A Property of Right Triangles and Some Classical Relations, Nov 1986, 640-643
Providing Opportunities for the Mathematically Gifted, K-12, Dec 1987, 749
Publications, 1995, 151-52, 346, 350, 524, 686, 778
Publications, 1996, 256, 258, 434, 436, 610, 782
Publications, 1997, 70, 334, 605
Publications, 1998, 187, 196–97, 238, 356, 443, 534
Publications, Apr. 1999, 370-71, May 1999, 454-56, Oct. 1999, 638, Dec. 1999, 842.
The Puzzling World of Polyhedral Dissections, Sep 1993, 504
Pyramids, Prisms, Antiprisms, and Deltahedra, Apr 1988, 261-265
The Pyramid Question: A Problem-Solving Adventure, Apr 1997, 262–68 (see also Sep 1997, 486).
Pythagoras Meets Fibonacci, Apr 1989, 277-282
A Pythagorean Party, Feb 1992, 112-114
The Pythagorean Theorem: An Infinite Number of Proofs? Sep 1997, 438–41
Pythagorean Triples, Nov 1986, 652-655
A Quadrilateral Hierarchy to Facilitate Learning in Geometry, Jan 1993, 30-36
A Rapidly Converging Recursive Approach to Pi, Feb 1993, 121-124
Reader Reflections, 1995, 74-76, 77, 78, 79, 90 (see also Dec 1995, 725, 728) 172, 174 (see also Nov 1995, 631), 176, 253-54, 266 (see also Dec 1995, 782-83), 358, 432-33, 434-435, 446, 504-5, 508, 618, 620-21, 622, 624, 631, 720, 722, 724, 725, 728, 782-83
Reader Reflections, 1996, 26–27 (see also Sep 1996, 500), 55–56, 58–60 (see also Oct 1996, 591), 83, 143, 147–48, 150, 201, 208, 251, 255, 263–64, 306, 368–69, 439, 440, 441–42, 499, 500, 576, 591, 625, 678, 701–2, 711
Reader Reflections, 1997 6, 31–32, 67–68 (see also Oct 1997, 571), 180, 260, 312, 339, 415, 478, 479–81, 484, 566–68, 571, 600, 611, 672, 676, 678, 680, 682, 691, 694, 764, 765, 766–67
Reader Reflections, 1998, 68, 70–71, 73–74, 100, 154, 238, 247, 275, 362, 364, 371, 396, 451, 510–16, 547, 616 (see also Jan 1998, 70–71), 618, 713 (see also Jan 1998, 41, Mar 1998, 196, 232), 740, 743, 820–21 (see also Apr 1998, 304)
Reader Reflections, Jan. 1999, 79, 80, 81, 82, Feb. 1999, 86, 149, 154, 156, Apr. 1999, 347-50, May 1999, 380, 382, Sept. 1999, 461, 522-25 (see also Mar 1999, 260-69, Apr 1999, 360-66), Oct. 1999, 611, 626 (see also Jan. 1999, 56-61), 627-29 (see also Jan. 1999, 50-54), Dec. 1999, 755, 779, 785, 797
Reader Reflections, Jan. 2000, 36–37, Feb. 2000, 85, 139–40, Mar. 2000, 170, 236–38, Apr. 2000, 265, 317, 334–35, Sept. 2000, 446, 522–24, 525, 527, Oct. 2000, 541–42, 607, 612, Dec. 2000, 734
Reflections Borders for Patchwork Quilts, Feb 1986, 138-143
Reflections on Miniature Golf, Oct 1994, 490-495
Reflective Paths to Minimum-Distance Solutions, Mar 1986, 174-177, 203
Regular Complex Polytopes, Apr 1992, 316
Reopening the Equilateral Triangle Problem: What Happens If…, Nov 1988, 634-638
Rethinking the First Two Years of High School Mathematics with the UCSMP, Nov 1995, 640-647
Retrospective: What Should Not Be in the Algebra and Geometry Curricula of Average College-Bound Students?, Feb 1995, 156-164
Revisiting the Interior Angles of Polygons, Nov 1987, 632-634
Roll-O-Ruler, Nov 1990, 686-687
Roller Dog, Oct 1990, 572
The Rug-Cutting Puzzle, Jan 1987, 12-14
Scope Math: A Computer Mathematics Course for Middle and Junior High School, Jan 1989, 67-68
Scratch Your Brain Where It Itches: Book D-1 Algebra, Book E-1 Geometry, Feb 1995, 154
Secondary School Results for the Fourth NAEP Mathematics Assessment: Algebra, Geometry, Mathematical Methods, and Attitudes, May 1988, 337-347, 397
The Secret of Anamorphic Art, Jan 1998, 24–32
Seven Ways to Find the Area of a Trapezoid, Apr 1990, 283-286
The Shape of a Baseball Field, May 1993, 366-371
Shapes, Space, and Symmetry, Sep 1992, 494
Shaping Space: A Polyhedral Approach, Dec 1988, 757
A Short Course in Geometry, Jan 1992, 76
The Shortest Route, Feb 1987, 88-93
The Sidesplitting Story of the Midpoint Polygon, Apr 1994, 249-256
The Sierpinski Triangle: Deterministic versus Random Models, Nov 1990, 617-621
Simple Constructions for the Regular Pentagon and Heptadecagon, May 1989, 361-365
Six Worlds, May 1989, 393
The Soap-Bubble Geometry Contest, Dec 1997, 746–50
Some Challenging Constructions, Apr 1986, 283-287
Some Colorful Mathematics, Mar 1996, 307–12, 318–20
Some Theorems Involving the Lengths of Segments in a Triangle, Oct 1987, 576-579
Soundoff: Geometry: A Remedy for the Malaise of Middle School Mathematics, Dec 1989, 678-680
Soundoff: High School Geometry Should Be a Laboratory Course, Jan 1990, 4-5
Soundoff: Teach Geometry before Second-Year Algebra, Apr 1988, 236, 298
Source Book of Problems in Geometry, Oct 1994, 573-574
A Space for Exploration in Geometry and Discrete Mathematics, Feb 1998, 102–8
A Special Circle for Quadratic Equations, Feb 1991, 125-127
Spheres in a Cone; or, Proving the Conic Sections, Mar 1987, 182-184
Spiral through Recursion, Oct 1994, 504-508
Square Circles, May 1993, 408-410
SSA and the Steiner-Lehmus Theorem, May 1992, 381-383
STAR Experimental Geometry: Working with Mathematically Gifted Middle School Students, May 1990, 351-357
Start the Year Right-Discover Pick's Theorem, Sep 1992, 424-425
Starting a Euclid Club, May 1996, 386–88
The Stella Octangula Activity Book, Manipulative Kit & Video, Feb 1992, 156
Stitching Quilts into Coordinate Geometry, Oct 1998, 587–92, 598–600
Studies in Mathematics Education: Teaching of Geometry, Vol. 5, Dec 1987, 753-754
The Super Factory, Dec 1986, 739
Supersolids: Solids Having Finite Volume and Infinite Surfaces, Jan 1989, 60-65
The Surface Plane, Jan 1993, 94
Symmetries of Irregular Polygons, May 1992, 342-344
Symmetry: A Unifying Concept, Apr 1995, 350
Symmetry in Chaos: A Search for Pattern in Mathematics, Art, and Nature, Sep 1993, 504
Table Tennis, Anyone? Using Ping-Pong to Teach the Coordinate Plane, Dec 1997, 712–14
Tan 2q Via the Scenic Route, Oct 1988, 553-554
Tangoes, May 1994, 383-384
Tape Constructions, May 1987, 346-352
Taxicab Geometry, an Adventure in Non-Euclidean Geometry, May 1988, 405-406
Teacher-Developed In-Service Geometry Program, Apr 1989, 301-302
Teachers Empowering Teachers: Computers in Geometry Classrooms, Nov 1991, 683
Teaching Relationships between Area and Perimeter with the Geometer's Sketchpad, Nov 1994, 590-594
Teaching Tessellating Art: Activities and Transparency Masters, Jan 1993, 94-95
Technical Calculus with Analytic Geometry, 3d ed, Feb 1987, 166
Technology and Reasoning in Algebra and Geometry, Feb 1996, 138–42
Technology Tips: A Global Electronic Community, Nov 1994, 650-651
Technology Tips: From Drawing to Construction with the Geometer's Sketchpad, May 1995, 428-431
Technology Tips: Technology in Perspective, Sep 1994, 450-452
Technology Tips: Visualizing the Behavior of Functions, Oct 1995, 604-607
TESgen (Geometry), Mar 1990, 730-731
Tessellations Using Logo, Oct 1987, 598
The Theorem of Pythagoras, Sep 1990, 488-490
Theorems in Motion: Using Dynamic Geometry to Gain Fresh Insights, Apr 1996, 330–32
Tilings and Patterns, Sep 1987, 497-498
Tilings and Patterns: An Introduction, Feb 1990, 167
Tips for Beginners: The Human Coordinate System, Feb 1991, 108-109
Tips for Beginners: Where Is My Reference Angle?, Oct 1992, 537
Transformational Geometry, Nov 1989, 660
Trap a Surprise in an Isosceles Trapezoid, Jan 1996, 12–14
A Triangle Divided: Investigating Equal Areas. Oct. 2000, 608–11
Triangles of Equal Area and Perimeter and Inscribed Circles, Jan 1988, 65-70
Trig and Analytic Geometry, 1 and 2, Sep 1991, 487
Trig Skits, Dec 1994, 702
Trigonometry for Non-Trigonometry Students, May 1994, 372-375
Trigonometry/Analytic Geometry 1 and 2, Oct 1993, 611
Trisecting an Angle-Almost, Mar 1988, 220-222
Trisecting an Angle-Almost, Part 2, Jan 1991, 20-23
The Trisection of Angles, Sep 1991, 493, 496
TurboGeometry Library, Oct 1988, 594
Turntable Illusions: Kinetic Optical Illusions for Your Record Turntable, Sep 1993, 506
The Twelve Days of Christmas and the Number of Diagonals in a Polygon, Dec 1986, 700-702
Two Egyptian Construction Tools, Feb 1993, 166-167
Two Problems That Illustrate the Techniques of Computer Simulation, Dec 1986, 726-731
Two Views of Oz, Feb 1987, 100-101
Understanding Algebraic Concepts and Conics with Paper Models, Apr 1994, 297-298
Understanding Polygons and Polyhedra with Googolplex, Nov 1989, 660-662
Universal Patterns: The Golden Relationship: Art, Math and Nature, Apr 1991, 332
The Use of Dot Paper in Geometry Lessons, Oct 1993, 558-561
Using a Surface Triangle to Explore Curvature, Feb 1994, 69-77
Using a Treasure Hunt to Teach Locus of Points, Feb 1993, 133-134
Using Dynamic Geometry Software to Teach Graph Theory: Isomorphic, Bipartite, and Planar Graphs, Apr 1997, 328–32
Using Lined Paper to Make Discoveries, Apr 1994, 246-247
Using Logo Pseudoprimitives for Geometric Investigations, Mar 1988, 166-174
Using Problems from the History of Mathematics in Classroom Instruction, May 1989, 370-377
Using Puzzles to Teach the Pythagorean Theorem, May 1989, 336-341
Using ROOTine Problems for Group Work in Geometry, Dec 1998, 794–98
Using Similarity to Find Length and Area, May 1994, 319-325
Using Technology to Introduce Radian Measure, Feb 1997, 168–72
Using the Assessment of Students' Learning to Reshape Teaching, Mar 1997, 223–29
Using The Geometer's Sketchpad to Visualize Maximum-Volume Problems. Mar. 2000, 224–28
Van Hiele Levels of Geometric Thought Revisited, Mar 1991, 210-220
The van Heile Model of Thinking in Geometry among Adolescents, Mar 1989, 224
Visions of Symmetry: Notebooks, Periodic Drawings, and Related Work of M. C. Escher, Nov 1993, 695
The Visual Mind: Art and Mathematics, Oct 1994, 574
Visual Thinking and Number Relationships, Apr 1988, 267-272
Visualization in Teaching and Learning Mathematics, Sep 1992, 495-496
Visualizing the Geometric Series, Feb 1989, 130-136
The Volume of a Cone, May 1993, 384-385
The Volume of a Sphere: A Chinese Derivation, Feb 1995, 142-145
The Vortex Tessellation. Apr. 1999, 286-90
What Do We Mean by Area and Perimeter?, May 1989, 342-344
What Is a Quadrilateral?, Dec 1993, 774-776
When Did Euclid Live? An Answer Plus a Short History of Geometry, Sep 1989, 460-463
When Is a Quadrilateral a Parallelogram?, Mar 1994, 208-211
Where Are We?, Sep 1996, 524–34
Where Is the Ball Going?, Sep 1986, 456-460
Which Method Is Best?, Feb 1988, 87-90
Why is the SsA Triangle-Congruence Theorem Not Included in Textbooks?, May 1990, 358-361
Why Not Three Dimensions? Oct. 1999, 560-63
Word Roots in Geometry, Oct 1994, 510-515
