circle

Question: Equation of the pair of tangents drawn from the origin to the circle ${{x}^{2}}+{{y}^{2}}+2gx+2fy+c=0$ is

1) $gx+fy+c({{x}^{2}}+{{y}^{2}})$

2) ${{(gx+fy)}^{2}}={{x}^{2}}+{{y}^{2}}$

3) ${{(gx+fy)}^{2}}={{c}^{2}}({{x}^{2}}+{{y}^{2}})$

4) ${{(gx+fy)}^{2}}=c({{x}^{2}}+{{y}^{2}})$

Solution:

Explanation: No Explanation

Tangent and normal to a circle

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