- My book
- Area histograms: choose your zones
- Circle touching in circle: ratio of radii
- Baravelle's Spiral and Infinite Geometric Series
- touching circles on a straight line: radii ratio
- Circle in tangents - elastic band drawing
- Cavalieri's Principle
- Wavy polygons
- la symétrie axiale: manipuler, observer, anticiper...
- Polygons: Exterior Angles
- Cubic Cross Sectional Area
- Clock triangles
