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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.
5 Ways to Prove a quadrilateral a parallelogram: 1. both pairs of opposite sides parallel 2. both pairs of opposite sides congruent 3. both pairs of opposite angles congruent 4. 1 pair of opposite sides both parallel and congruent 5. diagonals bisect each other. trapezoid in which the nonparallel sides are congruent the legs are congruent by definition the bases are parallel (by def. of trapezoid) the lower base angles are congruent the upper base angles are congruent the diagonals are congruent any lower base angle is supplementary to any upper base angle.