If both pairs of opposite sides are parallel, then it is called a parallelogram. Special cases of the parallelogram include the rectangle, the rhombus, and the square.
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They are quadrilaterals which have two pairs of parallel sides.
Quadrilaterals. Parallelograms have two pairs of parallel sides.
Trapezoids. All other quadrilaterals either have two pairs of parallel sides or none.
Kites and trapzuims.
quadrilaterals with two pairs of parallel sides