circle

Question: Equation of a circle whose centre is origin and radius is equal to the distance between the lines $x=1$ and $x=-1$ is

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

2) ${{x}^{2}}+{{y}^{2}}=\sqrt{2}$

3) ${{x}^{2}}+{{y}^{2}}=4$

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

Solution:

Explanation: No Explanation

Equations of circle Geometrical problems regarding circle

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