Images for Mathematics

The regular polyhedra are five

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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.

The image belongs to the sections...:
All together (3D geometry)