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:
“She leaned far out on the window-sill,
And shook it forth with a royal will.
“Shoot, if you must, this old gray head,
But spare your country’s flag,” she said.
A shade of sadness, a blush of shame,
Over the face of the leader came;”
—John Greenleaf Whittier (1807–1892)