Which of these statements describe properties of parallelograms? check all that apply.

a. diagonals bisect each other.
b. opposite angles are parallel.
c. opposite angles are congruent.
d. opposite sides are parallel.
e. consecutive angles are supplementary.
f. adjacent sides are congruent.

The statements that best describe the properties of parallelograms are options A, C, D and E. Parallelograms are a quadrilateral where diagonals bisect each other, opposite sides are parallel by definition, opposite sides are congruent and consecutive angles are supplementary.

The correct answers for this question are:
A. Diagonals bisect each other.
C. Opposite angles are congruent.
D. Opposite sides are parallel.
E. Consecutive angles are supplementary.
Those are the statements that describe properties of parallelograms. They are also belong to the family of quadrilateral.