If two adjacent angles of a parallelogram are equal, then it is a _______.
square or rhombus
rectangle or rhombus
kite or rhombus
rectangle or square
In a rectangle as well as in a square, each angle is 90o, so their adjacent angles are supplementary as well as equal.
If one angle of a parallelogram is 90 degrees and it’s adjacent sides are equal, then it is a _______ .