Two tangents drawn from the origin to the circle \[{{x}^{2}}+{{y}^{2}}+2gx+2fy+c=0\]will be perpendicular to each other, if

Two tangents drawn from the origin to the circle \[{{x}^{2}}+{{y}^{2}}

1.	Two tangents drawn from the origin to the circle \[{{x}^{2}}+{{y}^{2}}+2gx+2fy+c=0\]will be perpendicular to each other, if
A.	\[{{g}^{2}}+{{f}^{2}}=2c\]
B.	\[g=f={{c}^{2}}\]
C.	\[g+f=c\]
D.	None of these
Answer» B. \[g=f={{c}^{2}}\]

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Two tangents drawn from the origin to the circle \[{{x}^{2}}+{{y}^{2}}+2gx+2fy+c=0\]will be perpendicular to each other, if

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