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Question

Two adjacent angles of a parallelogram are as 1 : 2. Find the measures of all the angles of the parallelogram.

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Solution

Let the angle be A and B.The angles are in the ratio of 1:2.Measures of A and B are x° and 2x°.Then, C=A and D=B (opposite angles of a parallelogram are congruent)As we know that the sum of adjacent angles of a parallelogram is 180°. A+B=180°x°+2x°=180°3x°=180°x°=180°3=60°Thus, measure of A=60°, B=120°, C=60° and D=120°.

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