- Theorems on regular polygons
- A property of the regular heptagon
- Some properties of a regular heptagon
- Some properties of a regular nonagon
- A property of the regular nonagon
- Some interesting properties of the regular decagon
- Regular pentagon erected internally on a side of a regular decagon
- Touching pentagons
- Some properties of a regular 11-gon
- Some properties of a regular 13-gon
- Some properties of a regular 17-gon
- Unit lengths in the regular 19-gon
- A theorem on regular n-gons (n is even)