When a base is congruent it is the same shape and size, and parallel is when they will never touch. Therefore, on a square the top and bottom are congruent parallel bases. Some other examples are: Cylinders, rectangular prisms, and of course parallelograms.
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A prism has two congruent parallel bases.
An upright pentagonal prism has two congruent parallel bases and 15 edges.
Congruent
a cylinder
cylinder