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"Which of the following conditions is not sufficient to prove that a quadrilateral is a parallelogram?
a. Two pairs of sides are parallel.
b. Two pairs of opposite sides are congruent.
c. Two angles are supplementary.
d. Two diagonals bisect each other."


Sagot :

ANSWER:

C. Two angles are supplementary


A. B. D. are proven that a quadrilateral is a parallelogram.

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