The length of an arc of a circle of radius 4 cm is \pi cm. What is the magnitude of the angle subtended by the arc at the centre?
- A. \pi
- B. \pi/2
- C. \pi/3
- D. \pi/4 ✓
Correct Answer: D. \pi/4
Explanation
Angle in radians is \theta = \frac{L}{r}. Thus, \theta = \frac{\pi}{4}.
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