Is a Parallelogram A Rectangle, Can You Call A Rectangle A Parallelogram?
Compare a rectangle and the parallelogram :
A parallelogram is not a rectangle because the sides of rectangle form , while the sides of parallelogram may not be
A rectangle is a parallelogram because in rectangle opposite sides are parallel which fulfil the requirement of parallelogram
Hence, a parallelogram is not a rectangle but a rectangle is a parallelogram .