If the area of the circle is A1 and the ...

If the area of the circle is `A_1` and the area of the regular pentagon inscribed in the circle is `A_2,` then find the ratio `(A_1)/(A_2)dot`

A

`(pi)/(5)cos.(pi)/(10)`

B

`(2pi)/(5)sec.(pi)/(10)`

C

`(2pi)/(5)cosec.(pi)/(10)`

D

`(pi)/(5)sin.(pi)/(10)`

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The correct Answer is:

B

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