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No, only in a square (regular parallelogram).

The opposite angles are EQUAL in a parallelogram, and the adjacent angles are SUPPLEMENTARY

(they equal 180 degrees).

So if any angle in a parallelogram is a right angle, they all are. Otherwise, there are no right angles.

The angles of a parallelogram will average 90 degrees, as there are 360 degrees in any quadrilateral, (360/4 - 90) and 180 degrees in two adjacent non-equal angles (180/2 = 90).

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Q: Are all angles of a parallelogram equal to 90 degrees?
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