A decagonal based pyramid will have 11 faces, 11 vertices and 20 edges
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12 faces 20 vertices 30 edges
12 faces * * * * * Correct as far as it goes, but incomplete. 20 vertices 30 edges
A rectangular pyramid has 5 faces, 8 edges and 5 vertices.
A pentagonal pyramid has 6 faces, 6 vertices and 10 edges.
faces ,edges and vertices of a rectangular prism