The plural of polyhedron is polyhedra (same principle as "phenomenon" and "phenomena".
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A triangular prism is a polyhedron. Polyhedra is a plural term.
Polyhedra (plural; singular = polyhedron)
It's a polyhedron. A polyhedron (plural: polyhedra) is a three - dimensional figure made up of sides called faces, each face being a polygon.
No, they are the faces of the polyhedron.
They are the faces of the polyhedron.