Question

If a parallelogram has a right angle, is it a rectangle?

Answer 1

yes .if the parallelogram has a right angle then it is a rectangle.

Answer 2

Yep....coz opposite sides of a parallelogram are equal as well as parallel ... So if one angle is 90 deg. , then the opposite side of the side having right angle with the base will also be perpendicular to the base and these sides are already equal (opp sides of parallelogram are equal) ....thus it is a rectangle.