# Square Pyramid

A pyramid is a solid formed by a polygonal base whose vertices join to the same point - not coplanar with the base - called the *apex* of the pyramid. A pyramid with a quadrilateral base is also called *quadrilateral*, *square* if the base is square. In addition to the base, the pyramid has triangular faces said to be *lateral*; the edges that join the base and the apex are also *lateral*.

A quadrilateral pyramid has 5 vertices, 8 edges and 5 faces. You can check the Euler's formula for this solid:

What if applet does not run? |

Drag the mouse to rotate the pyramid. Use the right button to remove and put back individual faces.

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