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:
“When my face turned toward his,
I averted it
and looked at my feet.
When my ears clamored
to hear his talk,
I stopped them.
When my cheeks broke out
in sweat and goosebumps,
I covered them with my hands.
But Friends,
when the seams of my bodice
burst in a hundred places,
what could I do?”
—Amaru (c. seventh century A.D.)