- A40°
- B140°
- C20°
- D60°
Step-by-Step Solution
The nine central angles fill a complete turn, so each one is 360°/9 = 40°. The value 140° is the interior angle of the polygon, (9 − 2) × 180°/9, not the central angle.
Answer: A) 40°
A regular polygon has 9 sides. What angle does one of its sides subtend at the centre of the polygon?
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