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If \( r \) is the radius of inscribed circle of a regular polygon of \( n \)-sides, then \( r \) is equal to
(A) \( \frac{a}{2} \cot \left(\frac{\pi}{2 n}\right) \)
(B) \( \frac{a}{2} \cot \left(\frac{\pi}{n}\right) \)
(C) \( \frac{a}{2} \tan \left(\frac{\pi}{n}\right) \)
(D) \( \frac{a}{2} \cos \left(\frac{\pi}{n}\right) \)
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