Answer :

Given, ratio of the adjacent angles of a parallelogram is 1:3

By the property of parallelogram, the sum of adjacent angles of a parallelogram is 180°.


Let the adjacent angles are A and B.


A = x


B = 3x


A + B = x + 3x {A + B = 180


4x = 180 ̇


x = 45


A = 45


⇒∠B = 45×3 = 135


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