Platonic solid

There are 5 "Platonic solids" that were identified by the Greek mathematician Plato. They are three dimensional solids (polyhedra) having the following properties:

Tetrahedron 4 faces
6 faces
Octahedron 8 faces
Dodecahedron 12 faces
Icosahedron 20 faces
It turns out there are only five shapes that meet these criteria:

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