polygon with four sides
quadrilateral with both pairs of opposite sides parallel
parallelogram with four congruent sides
parallelogram with four right angles
parallelogram with four congruent sides and four right angles
quadrilateral with two pairs of adjacent sides congruent,no opposite sides congruent , and no parallel sides
quadrilateral with exactly one pair of parallel sides
trapezoid whose nonparallel opposite sides are congruent
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