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Question

In a parallelogram , one angle is 45th of its adjacent angle. Then the angles of the parallelogram are


A

60, 75

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B

48, 60

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C

100, 80

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D

80, 64

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Solution

The correct option is C

100, 80


Let x and y be the adjacent angles of the parallelogram.

Then, x+y=180 ...(1)

And, x=45y

5x=4y5x4y=0 ...(2)

Multiplying (1) by 4,

4x+4y=720 ...(3)

Adding (2) and (3),

9x=720x=80

y=18080=100

Therefore, the angles are 1000,800.


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