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Question

Three angles of quadrilaterals are 85, 60 and 75, then the fourth angle is______.


A

160°

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B

140°

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C

105°

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D

120°

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Solution

The correct option is B

140°


Given, A = 85, B = 60, and C = 75

We know that, the sum of all the angles of quadrilaterals is 360

A + B + C + D = 360

D = (360 - 85 - 60 - 75) = 140


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