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The area of the circle and the area of a...

The area of the circle and the area of a regular polygon of `n` sides and of perimeter equal to that of the circle are in the ratio of (a) `tan(pi/n):pi/n` (b) `cos(pi/n):pi/n` (c) `sin(pi/n) :pi/n` (d) `cot(pi/n):pi/n`

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