# Polyhedron

## 3D shape with flat faces, straight edges and sharp corners / From Wikipedia, the free encyclopedia

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In geometry, a **polyhedron** (plural **polyhedra** or **polyhedrons**; from Greek * *πολύ* (poly-) * 'many', and * *εδρον* (-hedron) * 'base, seat') is a three-dimensional shape with flat polygonal faces, straight edges and sharp corners or vertices.

3D shape with flat faces, straight edges and sharp corners

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Regular tetrahedron |
Small stellated dodecahedron |

Icosidodecahedron |
Great cubicuboctahedron |

Rhombic triacontahedron |
A toroidal polyhedron |

A convex polyhedron is the convex hull of finitely many points, not all on the same plane. Cubes and pyramids are examples of convex polyhedra.

A polyhedron is a 3-dimensional example of a polytope, a more general concept in any number of dimensions.