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By the properties of rectangle opposite sides are parallel,  the diagonals are equal and bisect each other.
hence, if the diagonals of a parallelogram are equal then it will be a rectangle

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by method

if diagonals are equal

bc ll ad

ab is the transeversal therefore angle dab and cba will be equal to 90'

therefore  in a llgm one angle is 90' then its a rectangle