Question

Is a Parallelogram A Rectangle, Can You Call A Rectangle A Parallelogram?

Answer 1

Compare a rectangle and the parallelogram :

A parallelogram is not a rectangle because the sides of rectangle form $90°$, while the sides of parallelogram may not be $90°$

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 .