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A pyramid is a polyhedron with a polygonal base and with all of the other faces triangles that meet at one vertex called the apex. The pyramid is named according to the shape of the base.

A cone is not a pyramid because it does not have triangular side faces.

In this topic we will look at some examples of pyramids.

Triangular-based pyramid

Triangular based pyramid

A triangular-based pyramid is also known as a tetrahedron. It has four faces that are all triangles.

This is the net of a regular tetrahedron. All sides are equilateral triangles.

Net of triangular based pyramid

A triangular-based pyramid has 4 faces, 4 vertices including the apex and 6 edges. To build a triangular pyramid with construction materials, we would need 4 triangles that join at the edges to make a closed three-dimensional shape or 6 edge pieces and 4 corner pieces to make a frame.