A pyramid is a generic term which is used to describe a 3-dimensional shape that consists of a polygonal face (normally called the base) with n sides, and n triangular faces (called lateral faces) attached to each edge of the polygon and meeting at an apex above the base.
A pyramid, whose base is an n-sided polygon has n+1 faces, n+a vertices and 2n edges.
Only the tetrahedon has 4 axes of symmetry. Most pyramids have none.
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