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Question

Three angles of a quadrilateral are 100, 90 and 85 .The fourth angle is


A

100

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B

85

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C

65

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D

75

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Solution

The correct option is B

85


Given the three angles of a quadrilateral are 100, 90 and 85. Let the fourth angle be 'x'
The sum of the angles of a quadrilateral is 360
100+90+85+x=360
x=360275
x=85

The fourth angle is 85.


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