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A polyhedron is a pyramid if it has 3 or more triangular faces sharing a common vertex. The base of a pyramid may be any polygon. If the base is a triangle too, then the pyramid has four faces. This is the simplest polyhedron, also called a tetrahedron, from the Greek word "tetra", meaning "four".

Click on the two pyramids to learn more.

                      

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 ·  Space figures

 ·  Prisms

 ·  Pyramids

 ·  Cylinders, cones
    and spheres


First Glance In Depth Examples Workout
First Glance   In Depth   Examples   Workout

Pyramids