trigonometry

Question: The sum of the radii of inscribed and circumscribed circles for an n sided regular polygon of side a, is



1) $a\cot \left( \frac{\pi }{n} \right)$
2) $\frac{a}{2}\cot \left( \frac{\pi }{2n} \right)$
3) $a\cot \left( \frac{\pi }{2n} \right)$
4) $\frac{a}{2}\cot \left( \frac{\pi }{2n} \right)$
Solution: Explanation: No Explanation
Circle connected with triangle

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