Posted by **Justin** on Sunday, May 23, 2010 at 6:04pm.

Which of the following conditions does not ensure that a quadrilateral is a parallelogram?

A) Both pairs of opposite sides are parallel.

B) The diagonals bisect each other.

C) A pair of opposite angles are congruent.

D) All of the above

Can anyone tell me if C is the right answer?

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