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The area of a circle is A(1) and the are...

The area of a circle is `A_(1)` and the area of a regular pentagon inscribed in the circle is `A_(2)`. Then `A_(1)//A_(2)` is

A

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

B

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

C

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

D

None of these

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A
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