Question

Please answer this question I will mark you brainliest

Answer 1

I will be using A, B, C not angle A or angle B.... Hope you will not mind it.

As we know A + B + C = 180

So, B + C = 180 - A

Or, (B/2) + (C/2) = 90 - (A/2) ....(1)

Now think in triangle BOC,

we have three angles, OBC, BOC and OCB

OBC = (B/2)

OCB = (C/2)

Let BOC = X

So, X + (B/2) + (C/2) = 180

From equation (1)

X + 90 - (A/2) = 180

X = 90 + A/2  (Proved !!!)