They are a pair of congruent and parallel faces of a prism.
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a triangular prism has to triangular bases while a rectangular prism has a rectangle as the bases.
Each and every prism has two parallel congruent bases. It is the shape of these bases that give the name to the prism: a pentagonal prism has pentagons (not necessarily regular) for its bases.
A prism will always have at least TWO bases
A triangular prism
A prism. A triangular prism has two congruent triangles as bases, rectangular prism, pentagonal prism, etc.