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If the area of circle is A(1) and area o...

If the area of circle is `A_(1)` and area of regular pentagon inscibed in the circle is `A_(2),` then find the ratio of area of two.

Text Solution

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The correct Answer is:
`(A_(1))/(A_(2))=(pir^(2))/(5/2r ^(2)cos 18^(@))=(2pi)/(5)sec ((pi)/(10))`
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