Prisms and pyramids are ______.

A polygon is a 2-D geometric figure that has a finite number of sides.

A 3-D shape with flat polygonal faces, straight edges and sharp corners or vertices is called a polyhedron.

Prism and pyramid are two key members of the polyhedron family. The lateral sides of a prism are rectangles, while the base is a polyhedron with two congruent bases in parallel planes.

A pyramid is a polyhedron with a single base and a shared vertex where all of the lateral sides meet.

A rectangular prism and a rectangular pyramid are shown below.