Platonic solid

In solid geometry and some ancient physical theories, a Platonic solid is a convex polyhedron with

Related Topics:
Solid geometry - Convex - Polyhedron

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• all its faces being congruent regular polygons, and
• the same number of faces meeting at each of its vertices.

(These are in contrast to

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• the Kepler-Poinsot solids, which are not convex, and
• the Archimedean and Johnson solids, which while having regular polygons as faces, are not themselves regular.)

The five Platonic solids were all known to the ancient Greeks.

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Platonic solid: Table ►