MathematicsMedium19×since 2002Q5034The sum of the radii of inscribed and circumscribed circles for an nnn sided regular polygon of side a,a,a, is :Aa4cot(π2n){a \over 4}\cot \left( {{\pi \over {2n}}} \right)4acot(2nπ)Bacot(πn)a\cot \left( {{\pi \over {n}}} \right)acot(nπ)Ca2cot(π2n){a \over 2}\cot \left( {{\pi \over {2n}}} \right)2acot(2nπ)Dacot(π2n)a\cot \left( {{\pi \over {2n}}} \right)acot(2nπ)Check answerSkip