Mathematics, 02.02.2020 20:49 bludov141ox1ocr

Which of the following are necessary when proving that the opposite sides of a parallelogram are congruent? a. alternate interior angles are supplementary. b. opposite sides are parallel. c. opposite sides are perpendicular. d. alternate interior angles are congruent

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Which of the following are necessary when proving that the opposite sides of a parallelogram are con...