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A parallelogram has 2 sets of parallel sides. The opposite sides  are equal in length and opposite angles are equal. Examples of  parallelograms are squares, rectangles and â¦ rhombuses. You can find  the perimeter of a parallelogram by doubling the base+side length. 6 people found this useful.
A quadrilateral is a parallelogram if: 1  Both pairs of opposite sides are parallel. (By definition). 2  Both pairs of opposite sides are congruent. If they are congruent, they must also be parallel.  One pair of opposite sides are congruent and parallel. Then, the other pair must also be parallel.