The equation \({x^2} + {y^2} + 2gx + 2fy + c\) represents a circle having radius

\(\sqrt {{{\left( {g - c} \right)}^2} + {{\left( {f - c} \right)}^2}}\)

\({{{\left( {g - c} \right)}^2} - {{\left( {f - c} \right)}^2}}\)

The equation \({x^2} + {y^2} + 2gx + 2fy + c\) represents a circle ha

1.	The equation \({x^2} + {y^2} + 2gx + 2fy + c\) represents a circle having radius
A.	\(\sqrt {{g^2} + {f^2} + c}\)
B.	\(\sqrt {{g^2} + {f^2} - c}\)
C.	\(\sqrt {{{\left( {g - c} \right)}^2} + {{\left( {f - c} \right)}^2}}\)
D.	\({{{\left( {g - c} \right)}^2} - {{\left( {f - c} \right)}^2}}\)
Answer» C. \(\sqrt {{{\left( {g - c} \right)}^2} + {{\left( {f - c} \right)}^2}}\)