Geometric Solids

Unlike prisms and cylinders, pyramids have only one base.  Like prisms, the base is a polygon and the pyramid is named by the shape of its base.  For example, a pyramid with a triangle for a base is called a triangular pyramid and a pyramid with a square base is called a square pyramid. The faces of a pyramid are triangles and they meet at a common vertex called the apex.  Similar to prisms, there are right pyramids and oblique pyramids. The drawing on the left is a right pyramid and the one on the right is an oblique pyramid.

pyramids 2

There are an infinite number of polygons.  Since pyramids are named by their polygonal base, there are an infinite number of kinds of pyramids.  The drawings below represent the net of some of the most common pyramids.

pyramid nets