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Mathematically, a pyramid is a 3-dimensional shape formed by a polygonal base with n sides, and n triangular faces meeting at an apex - which is a point not in the plane of the base. It therefore has n+1 faces, where n is the number of sides of the polgonal base.

Common pyramids have a triangular base (4 faces) or square base (5 faces).

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โˆ™ 2010-02-05 11:55:22
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Q: How many faces does a a pyramid have?
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