Final answer:
In parallelogram ABCD, if side AB equals 56 units, then side CD will also measure 56 units because opposite sides of a parallelogram are congruent.
Step-by-step explanation:
In a parallelogram, opposite sides are equal in length. Given parallelogram ABCD with side AB measuring 56 units, side CD will also measure 56 units. This is because in a parallelogram, AB is parallel and congruent to CD.