JEE Math Practice Question
The sum of the radii of inscribed and circumscribed circles for an $$n$$ sided regular polygon of side $$a, $$ is :
- A.$${a \over 4}\cot \left( {{\pi \over {2n}}} \right)$$
- B.$$a\cot \left( {{\pi \over {n}}} \right)$$
- C.$${a \over 2}\cot \left( {{\pi \over {2n}}} \right)$$
- D.$$a\cot \left( {{\pi \over {2n}}} \right)$$
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