face
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in geometry, a planar surface that forms part of the boundary of a solid object
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- has facet polytope
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Encyclopedic overview
The face (red) of a cube (black)
In solid geometry, a face is a flat surface (a planar region) that forms part of the boundary of a solid object. For example, a cube has six faces in this sense.
Excerpted from Wikipedia’s “face” article, available under the CC BY-SA 4.0 licence.