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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. 2  Both pairs of opposite sides are congruent. 3  One pair of opposite sides are congruent and parallel. quadrilateral is a parallelogram if: 1  Both pairs of opposite sides are parallel. ( 2 By definition). 3  Or: 4  Both pairs of opposite sides are congruent. 5  If they are congruent, they must also be parallel. 6  Or: 7  One pair of opposite sides are congruent and parallel.