- A75°
- B65°
- C105°
- D40°
Step-by-Step Solution
On the top straight line: 40° + (missing angle) + 65° = 180°, so the missing angle is 75°. The angle marked ? is vertically opposite to it, so ? = 75°.
Answer: A) 75°
Three straight lines cross at O. Use the angles given to find the angle marked ?.
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