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Question

Angles of a quadrilateral are in the ratio 3:6:8:13. The largest angle is :

A
178
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B
90
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C
156
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D
36
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Solution

The correct option is C 156
Given ratio of angles of quadrilateral ABCD is 3:6:8:13
Let the angles of quadrilateral ABCD be 3x,6x,8x,and 13x, respectively.

We know, by angle sum property, the sum of angles of a quadrilateral is 360o.
3x+6x+8x+13x=360o
30x=360o
x=360o12
x=12o.

A=3x=3×12o=36o,
B=6x=6×12o=72o,
C=8x=8×12o=96o
and D=13x=13×12o=156o.

The largest angle =156o.

Hence, option C is correct.

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