circle

Question: The equation of director circle of the circle ${{x}^{2}}+{{y}^{2}}={{a}^{2}},$ is



1) ${{x}^{2}}+{{y}^{2}}=4{{a}^{2}}$
2) ${{x}^{2}}+{{y}^{2}}=\sqrt{2}{{a}^{2}}$
3) ${{x}^{2}}+{{y}^{2}}-2{{a}^{2}}=0$
4) None of these
Solution: Explanation: No Explanation
Tangent and normal to a circle

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