Discussion
A pentagonal pyramid has
Answer: D
A pentagonal pyramid has six vertices and six faces.
Its faces are the pentagonal base plus five triangular side faces, 6 in all. Its vertices are the 5 corners of the base plus the apex, 6 in all. It has 10 edges: 5 round the base and 5 rising to the apex. Euler's formula checks this: \(V - E + F = 6 - 10 + 6 = 2\).
'Five faces' misses the base, 'five vertices' misses the apex, and 'six edges' is far short of the true 10, so the other options are wrong.
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