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The equation x^2 + y^2 + 2gx + 2fy + c = 0 represents a circle. Its radius is given by:

Asqrt(g + f - c)

Bsqrt(g^2 + f^2 - c)

Cg^2 + f^2 - c

Dsqrt(g^2 + f^2 + c)