Face (geometry)
In geometry, a face of a polyhedron is any of the polygons that make up its boundaries. For example, any of the squares that bound a cube is a face of the cube. The suffix -hedron is derived from the Greek word ἕδρα (hedra) which means "face".
Sometimes, in the case of a pyramid, the term face is understood to exclude the base.
The (two-dimensional) polygons that bound higher-dimensional polytopes are also commonly called faces. Formally, however, a face is any of the lower dimensional boundaries of the polytope, more specifically called an n-face.
Read more about Face (geometry): Formal Definition, Facets
Famous quotes containing the word face:
“He is no mystic, either, more than Newton or Arkwright or Davy, and tolerates none. Not one obscure line, or half line, did he ever write. His meaning lies plain as the daylight.... It has the distinctness of picture to his mind, and he tells us only what he sees printed in largest English type upon the face of things.”
—Henry David Thoreau (1817–1862)