1.

If inside a big circle exactly n(n ge3) 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

Answer»

`R(1+"cosec"(pi)/(N))`
`((1+"TAN"(pi)/(n))/(cospi//n))`
`[1+"cosec"(2pi)/(n)]`
`r(["sin"(pi)/(2n)+"COS"(pi)/(2n)])^2/(sinpi//n)`

Answer :A::D


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