Dodecahedron
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The Platonic solid with pentagonal sides is a dodecahedron. It has 12 pentagonal sides.
If you are thinking of a solid with pentagonal faces, a dodecahedron, there are twelve pentagons
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A pentagonal prism.
pentagonal prism
An object with 2 congruent pentagons at opposite ends connected with 5 rectangles is a pentagonal prism.