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Quadrilateral. Quadrilateral. Quadrilateral. Quadrilateral. Quadrilateral. Quadrangle. Quadrangle. Quadrangle. Quadrangle. Quadrangle. Parallelogram. Parallelogram. Parallelogram. Parallelogram. At least one pair of parallel sides. At least one pair of parallel sides.
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Quadrilateral Quadrilateral Quadrilateral Quadrilateral Quadrilateral Quadrangle Quadrangle Quadrangle Quadrangle Quadrangle Parallelogram Parallelogram Parallelogram Parallelogram At least one pair of parallel sides At least one pair of parallel sides At least one pair of parallel sides At least one pair of parallel sides At least one pair of parallel sides Opposite sides that are equal in length Opposite sides that are equal in length Opposite sides that are equal in length Opposite sides that are equal in length Four congruent or equal sides Four congruent or equal sides Four right angles Four right angles Opposite sides are parallel Opposite sides are parallel Opposite sides are parallel Opposite sides are parallel Opposite sides are parallel