# Right Triangular Prism

A *right triangular prism* is a *prism* with two parallel and congruent triangular faces and three rectangular faces perpendicular to the triangular ones. This is a polyhedron with 6 vertices, 9 edges, and 5 faces. If the triangular faces are equilateral, the prism is *regular*, in which case the rectangular faces are congruent.

The rectangular faces are said to be *lateral*, while the triangular faces are *bases*. If the bases are horizontal, they are sometimes called the top and the bottom (faces). The sides of the lateral faces are also called *lateral edges*.

You can check the Euler's formula for this solid:

What if applet does not run? |

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

(**Acknowledgement**: I have learned most of Java details from the implementation by Meiko Rachimow.)

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