circle

Question: The line $lx+my+n=0$ is normal to the circle ${{x}^{2}}+{{y}^{2}}+2gx+2fy+c=0$ , if



1) $lg+mf-n=0$
2) $lg+mf+n=0$
3) $lg=mf-n=0$
4) $lg-mf+n=0$
Solution: Explanation: No Explanation
Tangent and normal to a circle

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