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If r is the radius of inscribed circle o...

If r is the radius of inscribed circle of a regular polygon of n-sides ,then r is equal to

A

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

B

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

C

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

D

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

Text Solution

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The correct Answer is:
B
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