''pent'' means five so its five
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A 3 dimensional pentagon has 15 edges
A Pentagon Pyramid has six edges!
5 of each.
No. By definition a pentagon must have 5 edges. An irregular pentagon is a pentagon that has edges with lengths of different sizes. The internal angles of all vertices will not be identical in an irregular pentagon.
The 3D shape formed by regular pentagons is a dodecahedron, which has 30 edges.