Mathematics, 23.10.2019 22:00 Derrick253

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