Mathematics, 15.09.2019 20:20, carsondelane13

To prove that a given quadrilateral is a parallelogram, it is enough to show that:
both pairs of opposite sides are parallel.
the diagonals intersect each other.
pairs of adjacent sides are congruent.
all interior angles are right angles.
the diagonals are perpendicular bisectors of one another.

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To prove that a given quadrilateral is a parallelogram, it is enough to show that:
both pairs...