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A decahedron is a closed 3-D shape with ten polygonal faces. There are 32,300 topologically different decahdra and, since none of these are regular, the term is ambiguous. Some simple decahedra have names, such as:

  • nonagon-based pyramid
  • octagon-based prism
  • square antiprism
  • pentagonal dipyramid.

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9y ago

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