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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