circle

Question: The equation of the circle through the points of intersection of ${{x}^{2}}+{{y}^{2}}-1=0$ , ${{x}^{2}}+{{y}^{2}}-2x-4y+1=0$ and touching the line $x+2y=0$ , is

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

2) ${{x}^{2}}+{{y}^{2}}-x+20=0$

3) ${{x}^{2}}+{{y}^{2}}-x-2y=0$

4) $2({{x}^{2}}+{{y}^{2}})-x-2y=0$

Solution:

Explanation: No Explanation

System of circles

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