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the sum of the radii of inscribed and...

the sum of the radii of inscribed and circumscribed circules for an n sides regular polygon of side a, is

A

`a/2 cot ((pi)/(2 n))`

B

`a cot ((pi)/(2 n))`

C

`a/4 cot ""((pi)/(2n))`

D

`a cot "" ((pi)/( n))`

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A
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