Parallelograms
Rhombuses
Rectangles
Squares
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A rhomboid and oblong
A parallelogram (and all its special cases) has two pairs of opposite sides that are congruent. An isosceles trapezium has one pair of congruent opposite sides. Selected irregular quadrilaterals can have a pair.
A parallelogram has two pairs of congruent sides.
They are quadrilaterals which have two pairs of parallel sides.