A) \[2r\,d\cos \left( \frac{\theta }{2} \right)\]
B) \[2r\,\cot \left( \frac{\theta }{2} \right)\]
C) \[2r\,\tan \left( \frac{\theta }{2} \right)\]
D) \[2r\,\sin \left( \frac{\theta }{2} \right)\]
Correct Answer: D
Solution :
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