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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.
Because a quadrilateral is any four-sided shape, whereas a parallelogram must have opposite sides and angles equal. A trapezoid only has two sides and angles equal. In other â¦ words, a parallelogram has 2 pairs of parallel sides but a trapezoid only has one pair (top and bottom). + 2 others found this useful.