Mathematics, 12.06.2021 05:20, salmanderabdi12

Which of these is NOT a method for proving that a quadrilateral is a parallelogram?A. show that one pair of opposite sides is parallel and the other is not parallel B. show both pairs of opposite sides are congruent
C. show one pair of opposite sides are parallel AND congruent
D. show both pairs of opposite sides are parallel

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Which of these is NOT a method for proving that a quadrilateral is a parallelogram?A. show that one...