If the equation \[{{x}^{2}}+{{y}^{2}}+2gx+2fy+c=0\] represents a circle with x-axis as a diameter and radius a, then

If the equation \[{{x}^{2}}+{{y}^{2}}+2gx+2fy+c=0\] represents a circl

1.	If the equation \[{{x}^{2}}+{{y}^{2}}+2gx+2fy+c=0\] represents a circle with x-axis as a diameter and radius a, then
A.	\[f=2a,\ g=0,\ c=3{{a}^{2}}\]
B.	\[f=0,\ g=a,\ c=3{{a}^{2}}\]
C.	\[f=0,\ g=-2a,\ c=3{{a}^{2}}\]
D.	None of these
Answer» D. None of these

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If the equation \[{{x}^{2}}+{{y}^{2}}+2gx+2fy+c=0\] represents a circle with x-axis as a diameter and radius a, then

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