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[" The sum of radii of inscribed and cir...

[" The sum of radii of inscribed and circumscribed "],[" circles for an "n" -sided regular polygon of side "a" ,is "],[[" (a) "(a)/(2)cot(pi)/(2n)," (b) "(a)/(2)tan(pi)/(2n)],[" (c) acot "(pi)/(2n)," (d) None of these "]]

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