Question

Given the following diagram, if m∠COF = 150°, then m∠BOC =

Answer 1

i gotchu .

Answer:

C.

Explanation:

Answer 2

Complete question:
Given the following diagram, if and mCOF = 150°, then mBOC = _____.
150°
90°
45°
30°

I attached a possible diagram that I found in a similar problem.

Using the diagram, I can see that ∠COF is supplementary to ∠BOC. This means that the sum of their angles is equal to 180°.

m∠COF + m∠BOC = 180°
m∠COF = 150°

m∠BOC = 180° - 150° = 30° Choice D.