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Question

The ratio between three angles of a quadrilateral is 7:11:13 respectively, the value of the fourth angle of the quadrilateral is 112o. what is the difference between the largest and smallest angles of the quadrilateral ?

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Solution

Let 7x,11x,13x be the these angles of a quadrilateral
Given 4th angle = 112
By angle sum property,
7x+11x+13x+112=360
31x=360112=248
x=24831=8
7x=7×8=5611x=11×8=88
13x=13×8=104
Largets angle = 112
smallest angle = 56
Difference = 11256=56

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