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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 are:

  • nonagon-based pyramid
  • octagon-based prism
  • square antiprism
  • pentagonal dipyramid.
The number of lines of symmetry will depend on which of these - or the other 32,296 decahedra - you have in mind.
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Q: How many lines of symmetery in a decahedron?
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