If one angle of a parallelogram is right angle then all its angel are
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See there is a property of parallelograms that the opposite angles are equal.
therefore if one angle is 90° it's opposite must also be 90°.
also iits adjacent must also be 90° since adjacent angles in a parallelogram add up to 180°.
therefore if one angle of a parallelogram is right angle then all the other angles must also be 90°
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