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26 February, 07:50

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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  1. 26 February, 08:32
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    B. and D. are the right answers.
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