- A150°
- B40°
- C20°
- D30°
Step-by-Step Solution
With OA on the left, use the inner scale, which starts at 0 on the left. At OB it reads 30°. The angle is acute, so 150° is impossible.
Answer: D) 30°
Arm OA is on the left side of the base line. Find ∠AOB.
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