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The equation of the circumcircle of an e...

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