- A80°
- B180°
- C100°
- D90°
Step-by-Step Solution
Angles around a point add to 360°. 90° + 100° + 80° = 270°, so the last angle = 360° − 270° = 90°.
Answer: D) 90°
Four angles meet at point O, as shown. What is the angle marked with a question mark?
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