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:
““Child,
why do you waste your time
on childish things alone?”
“Clothe yourself in anger.”
“Take courage,
and cast off this honesty
toward your lover.”
When her girlfriends
gave her such advice,
she answered,
her face frightened,
“Speak softly.
The lord of my breath
is still in my heart.
No doubt he’ll hear you.””
—Amaru (c. seventh century A.D.)