- Euclidean Geometry
- Golden Triangle and Spiral
- Pythagorean Theorem - a "proof without words"
- Kaleidoscope
- Special points in triangles
- Triangle equidecomposable with a parallelogram
- Triangle equidecomposable with a parallelogram (2)
- Il puzzle di Haberdasher - Haberdasher's puzzle
- Construction of a triangle, given a side and two angles
- Napoleon's Theorem - Defining Hypothesis and Thesis
- Ruotiamo...
