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**A pyramid is a geometric solid, having a polygon as its base (or bottom), with triangles for its faces (or sides) and a vertex that is perpendicular to the base.

The polygon base can have any number of sides, 3 or greater.

A pyramid gets its name from its polygon base and *not* from its faces.

So, the diagram at the top of this page depicts a square pyramid.
The diagrams below show a triangular pyramid and a pentagonal pyramid.

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Like the diagram at the ***top* of the page, the Great Pyramid of Egypt has a square base and 4 triangular faces and
that's what most people think of when they hear the word 'pyramid'.

However, mathematically speaking, the base could have any number of sides,
3 or greater.

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