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If inside a big circle exactly n(nlt=3) ...

If inside a big circle exactly `n(nlt=3)` small circles, each of radius `r ,` can be drawn in such a way that each small circle touches the big circle and also touches both its adjacent small circles, then the radius of big circle is `r(1+cos e cpi/n)` (b) `((1+tanpi/n)/(cospi/pi))` `r[1+cos e c(2pi)/n]` (d) `(r[s inpi/(2n)+cos(2pi)/n]^2)/(sinpi/n)`

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