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Polyhedron
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A polyhedron (one polyhedron, many polyhedra, or polyhedrons) is a geometrical shape. It is a 3D shape with flat faces, and straight edges. Usually it is defined by the number of faces, or edges.
Mathematicians do not agree on what makes a polyhedron. They do agree that there are five Platonic solids.
Naming
Usually, polyhedra are named by the number of faces they have. The first polyhedra are the tetrahedron, which is made of four triangles, pentahedron (five faces, can look like a foursided pyramid), hexahedron (six faces, a cube if it is regular), heptahedron (seven faces) and octahedron (eight faces). Prisms, pyramids and other shapes can also be named according to how many faces they have.
Other websites
 Eric W. Weisstein, Polyhedron at MathWorld.
 Making Polyhedra
 Polyhedra Pages
 Stella: Polyhedron Navigator – Software for exploring polyhedra and printing nets for their physical construction. Includes uniform polyhedra, stellations, compounds, Johnson solids, etc.
 The Uniform Polyhedra
 Virtual Reality Polyhedra – The Encyclopedia of Polyhedra
 Paper Models of Polyhedra Many links
 Paper Models of Uniform (and other) Polyhedra
 Interactive 3D polyhedra in Java
 World of Polyhedra – Comprehensive polyhedra in flash applet, showing vertices and edges (but not shaded faces)
 Polyhedra software, diecast models, and posters
 Electronic Geometry Models – Contains a peer reviewed selection of polyhedra with unusual properties
 Symmetry, Crystals and Polyhedra
 uniform solution for uniform polyhedra by Dr. Zvi Har'El
 Java applet with the use of kaleido
 Origami Polyhedra – Models made with Modular Origami
 Polyhedra Collection – Various virtual and physical polyhedra models
