In the diagram above, the value of angles b + c is

Correct Answer: Option A

Explanation

a + c + d – 180^o[sum of angles in triangle] x = a[vertical opp. ∠s] y + x + d = 180^o[sum of ∠s in a Δ] y + a + d = 180^o
y + a + d = a + c + d
y = c
but b + y = 180^o [sum of ∠s on a straight line ] b + c = 180^o; Ans = A = 180^o