If one angle of a parallelogram is 90 degree prove that it is a rectangle

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Please find below the solution to the asked query :



As each angle is 90° and opposite sides are equal .
So, it is a rectangle.
 
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In a parallelogram <A = 90
So <C = 90 ( Opposite angles in a parallelogram are equal )
So <B = 90 ( Sum of the co interior  angles is equal to 180 )
So <D = 90 ( Opposite angles in a parallelogram are equal )
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OPP. ANGLE EQUAL...THEREFORE ALL ANGLES 90 DEGREE
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