A) \[{{g}^{2}}+{{f}^{2}}=c\]
B) \[{{g}^{2}}+{{f}^{2}}>c\]
C) \[{{g}^{2}}+{{f}^{2}}+c=0\]
D) None of these
Correct Answer: A
Solution :
Using condition of point circle \[R=\sqrt{{{g}^{2}}+{{f}^{2}}-c}=0\Rightarrow {{g}^{2}}+{{f}^{2}}=c\].
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