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A pentagonal what? A pentagonal pyramid or pentagonal prism have different numbers of vertices.
Pentagonal Prism = 2 pentagonal bases + 5 lateral faces Pentagonal Prism = 7 faces Pentagonal Prism has 10 vertices Pentagonal Prism has 15 edges
A Pentagonal Prism has 15 edges.
10
Pentagonal Prism = 2 pentagonal bases , 5 lateral faces, 10 vertices Pentagonal Prism = 7 faces, 15 edges