- A60°
- B120°
- C180°
- D240°
Step-by-Step Solution
The angle marked ? is opposite the 120° angle, so they are vertically opposite angles, which are equal: ? = 120°. (60° is the neighbouring angle on the line.)
Answer: B) 120°
Two straight lines cross at O. One angle is 120°. Find the angle marked ?.
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