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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

isosceles trapezoid

trapezoid whose nonparallel opposite sides are congruent

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