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:
“I don’t know how long it has been since my ear has been free from the roll of a drum. It is the music I sleep by, and I love it.... I shall remain here while anyone remains, and do whatever comes to my hand. I may be compelled to face danger, but never fear it, and while our soldiers can stand and fight, I can stand and feed and nurse them.”
—Clara Barton (1821–1912)