The regular polyhedra are five
A way to see why there are only 5 regular polyhedra: we can't use equilateral triangles as faces of a polyhedron by putting 7 (or more) triangles around each vertex because we wouldn't get a convex polyhedron.
The image has been realized for the exhibition Simmetria, giochi di specchi - Symmetry, playing with mirrors.
© matematita
The image belongs to the sections...:
All together (3D geometry)
