the angles of cyclic quadrilateral ABCD angle A = 6 X + 10 degree angle B = 5x degree angle C = X + Y degree and Angle d = 3 Y - 10 degree
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6x+10+5x+x+y+3y-10=360
12x+4y=360
x+y=360/12*4
=360/48
x+y=15
therefore, the value of x and y is 15
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