In geometry, a "face" is a flat surface that forms part of the boundary of a solid object. Faces are the two-dimensional shapes that make up the surfaces of three-dimensional figures, such as polyhedra. Each face is typically a polygon, and the arrangement of these faces defines the overall shape of the solid. For example: - A cube has six square faces. - A triangular prism has two triangular faces and three rectangular faces. - A tetrahedron has four triangular faces.
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