In geometry, a **facet** refers to a flat surface that forms part of the boundary of a higher-dimensional geometric object. The term is most commonly used in the context of polyhedra and polytopes. 1. **In Polyhedra**: For a three-dimensional polyhedron, a facet typically refers to one of the polygonal faces of the polyhedron. For example, a cube has six facets, all of which are square faces.
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