circle

Question: The equation of the circle which touches both axes and whose centre is $({{x}_{1}},\ {{y}_{1}})$ is

1) ${{x}^{2}}+{{y}^{2}}+2{{x}_{1}}(x+y)+x_{1}^{2}=0$

2) ${{x}^{2}}+{{y}^{2}}-2{{x}_{1}}(x+y)+x_{1}^{2}=0$

3) ${{x}^{2}}+{{y}^{2}}=x_{1}^{2}+y_{1}^{2}$

4) ${{x}^{2}}+{{y}^{2}}+2x{{x}_{1}}+2y{{y}_{1}}=0$

Solution:

Explanation: No Explanation

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