The following are true of a pyramid:

• Its base is a polygon.


• It is named for the shape of its base. For example, a pentagonal pyramid would have a pentagonal base.


• Its lateral faces meet at the apex of the pyramid.


• The lateral surface is made up of triangles.


• The number of triangular lateral faces is equal to the number of sides forming the polygonal base.


• It has faces, vertices, and edges that can be counted.


• If a plane intersects the pyramid and is parallel to the base, the cross section is similar to the base.

A pyramid has one base and one apex, regardless of orientation.

Pyramid Activity