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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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