They are its faces
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It is a face of the polyhedron
The flat surfaces of all polyhedra are called faces and a rectangular prism is simply one kind of polyhedron.
A sphere is not a polyhedron because it has no edges, no vertices and no flat faces The word 'polyhedron' means many faces.
A flat surface generally refers to a horizontal surface and is referred to as the plane.
One flat surface is a table. Many flat surfaces are facets.