Proving quadrilaterals are parallelograms.
One opposite pair of sides theorem: if one pair of sides of a quadrilateral are parallel and congruent, then it is a parallelogram.
More ways to prove a quadrilateral is a parallelogram:
Both pairs of opposite sides are parallel
both pairs of opposite sides are congruent
both pairs of opposite angles are congruent
any angle is supplementary to both of its consecutive angles
diagonals bisect eachother
one pair of opposite sides are congruent and parallel
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