One polyhedron; many polyhedra. Simple,wasn't that?
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Prisms are a subset of polyhedra (or polyhedrons!)
Polyhedra (singular = polyhedron).
WHat is the difference between polyheron and platonic solid
Yes. It is one of the five regular polyhedra known from ancient Greek times or earlier.See http://www.math.rutgers.edu/~erowland/polyhedra.html .
The flat surfaces of all polyhedra are called faces and a rectangular prism is simply one kind of polyhedron.