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

Answer:

c po

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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,