ABCD is forming a Cycling Quadrilateral
we know that, sum of opposite angle in Cycling Quadrilateral is 180°
=>B + D = 180°
=>5x+2 +68 = 180
=>5x + 70 = 180
=> 5x = 110
=> x = 22°
Angle B = 5×22+2 = 110+2 = 112°>
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