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:
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A decahedron has no cornets.
A decahedron has ten faces.
A decahedron is a solid shape with ten flat faces.
No.
A decahedron.