A pentagonal what? A pentagonal pyramid or pentagonal prism have different numbers of vertices.
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A pentagonal pyramid has 6 vertices.
how many vertices does a pentagonal cylinder have? how many vertices does a pentagonal cylinder have?
Pentagonal Prism = 2 pentagonal bases + 5 lateral faces Pentagonal Prism = 7 faces Pentagonal Prism has 10 vertices Pentagonal Prism has 15 edges
A pentagonal rotunda have 20 vertices
A pentagonal dipyramid (or bipyramid) has 15 edges, 10 faces and 7 vertices.