Which of the following is a characteristic of all parallelograms? a. consecutive angles are congruent. b. there are 4 right angles. c. the diagonals are perpendicular. d. both pairs of opposite sides are congruent.

Let us check each statement one by one:

A.Consecutive angles are congruent.

In a parallelogram consecutive angles are supplementary.

So this statement is incorrect.

B. There are 4 right angles.

Not all angles are right angles in all parallelograms.

So this statement is incorrect.

C. The diagonals are perpendicular.

Not every parallelogram has perpendicular diagonals.

This statement is incorrect.

D. Both pairs of opposite sides are congruent.

This statement is correct for all parallelograms.

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