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For every polyhedron, there is a dual which is a polyhedron that has:

  • a face where the first had a vertex,
  • a vertex where the first had a face,
  • the same number of edges.

A self-dual polyhedron is a polyhedron whose dual is the same shape.

All pyramids, for example, are self-dual.

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Q: What is a self dual polyhedron?
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