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.
TEKS: 7(8)(A), 7(8)(B), 7(9)(A), 7(9)(D)