Is a rectangle a parallelogram always, sometimes or never?
Compare a rectangle and a parallelogram:
A parallelogram is a rectangle. It is true when the parallelogram has these properties listed below. It is not true when a parallelogram has no right angle. A quadrilateral (a polygon with vertices) with pair of opposite sides parallel to each other that is is parallel to and is parallel to is called parallelogram
The properties of rectangle are
Hence, a rectangle is always a parallelogram.