Question

In a cyclic quadrilateral ABCD, it is being given that ` angle A = (x + y + 10)^(@), angle B = ( y + 20 ) ^(@), angle C = (x + y - 30 ) ^(@) and angle D = (x + y ) ^(@)`. Then, ` angle B ` ?
A. `70^(@)`
B. `80^(@)`
C. `100^(@)`
D. `110^(@)`

Answer 1

Correct Answer - B
` angle A + angle C = 180^(@) and angle B + angle D = 180^(@)`
The given ` x + y = 100 and x + 2y = 160`.