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The equation of circumcircle of an equil...

The equation of circumcircle of an equilateral triangle is `x^2+y^2+2gx+2fy+c=0` and one vertex of the triangle is (1,1).The equation of incircle of the triangle is

A

`4(x^2+y^2)=g^2+f^2`

B

`4(x^2+y^2)+8gx+8fy=(1-g)(1+3g)+(1-f)(1+3f)`

C

`4(x^2+y^2)+8gx+8fy=g^2+f^2`

D

none of these

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