the 4 angle of a quadrilateral are x,x+5,x-5 and 30 degrees.so what is the measure of largest angle?
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sum of angles of quadrilateral = 360°
=> x + x+5 + x-5 + 30 = 360
=> 3x = 330
=> x = 110°
the largest angle = x+5 = 110 + 5 = 115°
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