Question

Which of the following is not an attribute of parallelograms?

Opposite sides are parallel.
Diagonals bisect each other.
Consecutive angles are supplementary.
Diagonals are congruent.

Answer 1

On a basic parallelogram, opposite sides are parallel, diagonals bisect each other and, consecutive angles are supplementary. However on a parallelogram diagonals aren't congruent.

So the answer is D