Answer:
The diagonals of the parallelogram are congruent.
Step-by-step explanation:
In every parallelogram the opposite angles are congruent, this means that opposing angles measure the same, a rombus,a square, every parallelogram has congruent opposite angles, as well as diagonal isecting the angles and its opposite sides are congruent, the only thing that would tell us that the parallelogram is definetly a rectangle is that the diagonals of the parallelogram are congruent, because only in that way we know that we have four 90º angles, that form a rectangle.
