In geometry, a **triangular prism** is a three-sided prism; it is a polyhedron made of a triangular base, a translated copy, and 3 faces joining corresponding sides.

Equivalently, it is a pentahedron of which two faces are parallel, while the surface normals of the other three are in the same plane (which is not necessarily parallel to the base planes). These three faces are parallelograms. All cross-sections parallel to the base faces are the same triangle.

Read more about Triangular Prism: As A Semiregular (or Uniform) Polyhedron, Volume, Related Polyhedra and Tilings, See Also

### Famous quotes containing the word prism:

“Neither can I do anything to please critics belonging to the good old school of “projected biography,” who examine an author’s work, which they do not understand, through the *prism* of his life, which they do not know.”

—Vladimir Nabokov (1899–1977)