circle

Question: Square of the length of the tangent drawn from the point $(\alpha ,\beta )$ to the circle $a{{x}^{2}}+a{{y}^{2}}={{r}^{2}}$ is

1) $a{{\alpha }^{2}}+a{{\beta }^{2}}-{{r}^{2}}$

2) ${{\alpha }^{2}}+{{\beta }^{2}}-\frac{{{r}^{2}}}{a}$

3) ${{\alpha }^{2}}+{{\beta }^{2}}+\frac{{{r}^{2}}}{a}$

4) ${{\alpha }^{2}}+{{\beta }^{2}}-{{r}^{2}}$

Solution:

Explanation: No Explanation

Tangent and normal to a circle

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