Its "bases"
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Both a cylinder and a prism can have parallel and congruent bases.
Prism!
A Base. * * * * * What? Every prism, by definition, has two congruent faces which may be called the bases of the prism.
A polyhedron that has 2 congruent faces is a PRISM. To be a prism, all the other sides (not including the 2 that are congruent) have to be 4-sided.
No, a prism cannot have curved sides. A prism is a polyhedron with two parallel and congruent polygonal bases connected by lateral faces that are parallelograms. The lateral faces of a prism are always flat, planar surfaces that are perpendicular to the bases. Curved sides would not meet the definition of a prism.