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:
“Suddenly, through birthing a daughter, a woman finds herself face to face not only with an infant, a little girl, a woman-to- be, but also with her own unresolved conflicts from the past and her hopes and dreams for the future.... As though experiencing an earthquake, mothers of daughters may find their lives shifted, their deep feelings unearthed, the balance struck in all relationships once again off kilter.”
—Elizabeth Debold (20th century)