posted by Justin .
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?
I agree with C because I can easily draw a four sided figure with a pair of opposite angles congruent and the other pair not congruent.