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If inside a big circle exactly n(n ge3) ...

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

A

`r(1+"cosec"(pi)/(n))`

B

`((1+"tan"(pi)/(n))/(cospi//n))`

C

`[1+"cosec"(2pi)/(n)]`

D

`r(["sin"(pi)/(2n)+"cos"(pi)/(2n)])^2/(sinpi//n)`

Text Solution

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The correct Answer is:
A, D
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