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:
“There grew pied wind-flowers and violets,
Daisies, those pearl’d Arcturi of the earth,
The constellated flower that never sets;
Faint oxlips; tender bluebells at whose birth
The sod scarce heaved; and that tall flower that wets
Its mother’s face with heaven-collected tears,
When the low wind, its playmate’s voice, it hears.”
—Percy Bysshe Shelley (1792–1822)