If ∠A = 2x and ∠B = 4x such that ∠A and ∠B are supplementary, then the value of x is:
60o
90o
180o
30o
Since, angles A and B are supplementary, we have
∠A + ∠B = 180o
i.e. 2x + 4x = 180o
Or, 6x = 180o
Or, x = 30o