
In geometry, an Archimedean solid is a highly symmetric, semi-regular convex polyhedron composed of two or more types of regular polygons meeting in identical vertices. They are distinct from the Platonic solids, which are composed of only one type of polygon meeting in identical vertices, and from the Johnson solids, whose regular polygonal faces...
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http://en.wikipedia.org/wiki/Archimedean_solid

A convex semi-regular polyhedron – a solid made from regular polygonal sides of two or more types that meet in a uniform pattern around each corner. (A regular polyhedron, or Platonic solid, has only one type of polygonal side.) There are 13 Archimedean solids. Although they are named after th...
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http://www.daviddarling.info/encyclopedia/A/Archimedean_solid.html
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