Platonic solid definitions

Platonic solid

In Euclidean geometry, a Platonic solid is a regular, convex polyhedron with congruent faces of regular polygons and the same number of faces meeting at each vertex. Five solids meet those criteria, and each is named after its number of faces. Geometers have studied the mathematical beauty and symmetry of the Platonic solids for thousands of years...
Found on http://en.wikipedia.org/wiki/Platonic_solid

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Platonic solid

any of the five geometric solids whose faces are all identical, regular polygons meeting at the same three-dimensional angles. Also known as the five ... [6 related articles]
Found on http://www.britannica.com/eb/a-z/p/78

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Platonic solid

Any of the five regular polyhedrons – solids with regular polygon faces and the same number of faces meeting at each corner – that are possible in three dimensions. They are the tetrahedron (a pyramid with triangular faces), the octahedron (an eight-sided figure with triangular faces), t...
Found on http://www.daviddarling.info/encyclopedia/P/Platonic_solid.html

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