- NEW! Animated Activities (Steve Garland)
- NEW! Brownies and Word Problems (Josh Taton)
- NEW! Playing with geoboards and coins: An exploration towards Pick’s theorem (Christopher Woodward)
- Icebreaker
- Activity
- Alternate Handout (Iuliana Radu)
- NEW! Non-Euclidean Geometries (Samantha Pezzimenti)
- NEW! Polygon explorations with pattern blocks (Christopher Woodward)
- Mysteries of Bicycle Tracks (James Tanton)
- NEW! Patterns and math in quilts (Matt Roscoe)
- NEW! Puzzles, Bands, and Knots (Jennifer Mann)
- Any Conic Section (So Long As It Is a Parabola) (Tatiana Shubin)
- Big Box Problems (Harold Reiter; TeX files and solutions available upon request)
- The Biggest, the Smallest… (Tatiana Shubin)
- Classical Geometric Construction (Tom Davis)
- Curves in Computer Graphics (Tom Davis)
- Euler’s Theorem (Tom Davis)
- Four Points on a Circle (Tom Davis)
- Geodesic Domes (Tom Davis)
- Geogebra Explorations and the Parallel Postulate (Altha Rodin)
- Geogebra Problems (Altha Rodin)
- (Geogebra) Straightedge and Compass Construction (Altha Rodin)
- Geometry and Geography (Tom Davis)
- Grid Luck (Tatiana Shubin)
- Have Colors – Will Paint (Tatiana Shubin)
- Homogeneous Coordinates for Computer Graphics (Tom Davis)
- (Mostly) Simple (Mostly Area) Problems with Solutions (Tatiana Shubin)
- Pick’s Theorem (Aimee Johnson & Joshua Sabloff)
- Pick’s Theorem (Matthias Beck)
- Pick’s Theorem (Tom Davis)
- Polyhedral Symmetry (Sam Vandervelde)
- Practical Calculation of Polygonal Areas (Tom Davis)
- Projective Geometry (Tom Davis)
- The Circles of Apollonius (Chris Goff)
- The Mathematics of Sona (Sand Drawings from Central Africa) (Paul Ellis)
- The Mathematics of Zome (Tom Davis)
