Answer :
If a parallelogram has right angles (angles with measures of 90 degrees) for all its angles, it is a rectangle.
If you know for a fact that it's a parallelogram, then you only
need to show that any one angle is a right angle (90 degrees),
and that will prove that it's a rectangle.
need to show that any one angle is a right angle (90 degrees),
and that will prove that it's a rectangle.
