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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.
Square. 4 congruent sides. 4 right angles (90Â°). Opposite sides are parallel. All angles are congruent. Trapezoid. Only one pair of opposite sides is parallel. Summary. A quadrilateral is a mathematical name for a four-sided polygon. Parallelograms, squares, rectangles, and trapezoids are all examples of quadrilaterals.