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Quadrilaterals

The two pairs of adjacent sides are equal.
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The two pairs of opposite sides are parallel.
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The two pairs of opposite sides are parallel, and all angles are right angles.
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The two pairs of opposite sides are parallel, and all four sides are equal.
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The two pairs of opposite sides are parallel, all sides are congruent, and all angles are right angles.
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Only one pair of opposite sides must be parallel.
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Geometry Expressions