Polytopes include polygons (two-dimensional), polyhedra (three-dimensional), polychora (four-dimensional), and their higher dimensional analogs. An n-dimensional polytope is built up from multiple (n-1)-dimensional polytopes. Thus, polyhedra are built up from polygons, and polychora are built up from polyhedra. A regular polytope is composed of regular (n-1)-dimensional polytopes. There are an infinite number of regular convex polygons, five regular convex polyhedra, six regular convex polychora, and three regular convex polytopes for all dimensions five or higher.

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The Geometry Junkyard
Comprehensive list of links to sites on geometric properties of the shapes.
Numericana - Polyhedra & Polytopes
Enumeration, cartesian coordinates of vertices, naming, and counting the shapes.
Pick's Theorem
Describes a theorem for finding an area of simple lattice polygons. Includes proof and Java applet simulation.
Zometool
Educational toys used to teach geometry and model building to create squares, spheres, stars and other regular shapes with sticks and connecting pieces.
[Mozilla Einstein]
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September 10, 2016 at 6:45:05 UTC
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