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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`

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The correct Answer is:
`therefore A_(1) : A_(2) = (2pi r ^(2))/(5r ^(2) cos 180^(@)) = (2pi )/(5) sec "" (pi)/(10)`
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