Math

How many faces does a pentagonal pyramid have?

If you are referring to a pyramid with a pentagonal base and triangular sides, the answer is six.

If you are referring to a regular polyhedron for which all sides are regular pentagons of the same size, the answer is twelve. That figure is called a dodecahedron.

See http://en.wikipedia.org/wiki/Dodecahedron
for an illustration.

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