A) \[{{(x_{1}^{2}+y_{1}^{2}+2g{{x}_{1}}+2f{{y}_{1}}+c)}^{1/2}}\]
B) \[{{(x_{1}^{2}+y_{1}^{2})}^{1/2}}\]
C) \[{{[{{({{x}_{1}}+g)}^{2}}+{{({{y}_{1}}+f)}^{2}}]}^{1/2}}\]
D) None of these
Correct Answer: A
Solution :
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