a 3D pentagon
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A pentagonal prism will have 15 edges.
a pentagonal pyramid or a pentagonal prisim
A pentagon is a 2 dimensional object. The 3 dimensional object, with 12 pentagonal faces, is called a dodecahedron.
If you are thinking of a solid with pentagonal faces, a dodecahedron, there are twelve pentagons
pentagon A pentagon. A 5-sided figure is called a pentagon. pentagon A five sided figure is called a pentagon