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Polyhedron
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Most dice are polyhedra.
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 four-sided 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, die-cast 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
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