It is a pentagon.
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It is a pentagon.
The base of a pentagonal prism is a pentagon. Just like a square pyramid has a square for a base, a pentagonal prism has a pentagon for a base.
hexahedron ex:cube, triangular dipyramid, triangular deltohedron, pentagonal pyramid
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In general, any 10-sided polyhedron is called a decahedron. With 10 regular triangles for faces, you may have a pentagonal bipyramid.