A pyramid has 10 faces. What is the shape of its base?

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A Nonagon
B Decagon
C Heptagon
D Octagon

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Answer: A. Nonagon

A pyramid with an n-sided base has n triangular faces plus 1 base, so n + 1 faces. If n + 1 = 10, then n = 9, so the base is a nonagon.

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A pyramid has 10 faces. What is the shape of its base?

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