Equation of the tangent to the circle \[{{x}^{2}}+{{y}^{2}}={{a}^{2}}\]which is perpendicular to the straight line \[y=mx+c\]is

\[x+my=\pm a\sqrt{1+{{(1/m)}^{2}}}\]

\[y=-\frac{x}{m}\pm a\sqrt{1+{{m}^{2}}}\]

\[x+my=\pm \text{ }a\text{ }\sqrt{1+{{m}^{2}}}\]

\[x-my=\pm a\sqrt{1+{{m}^{2}}}\]

Equation of the tangent to the circle \[{{x}^{2}}+{{y}^{2}}={{a}^{2}}\

1.	Equation of the tangent to the circle \[{{x}^{2}}+{{y}^{2}}={{a}^{2}}\]which is perpendicular to the straight line \[y=mx+c\]is
A.	\[y=-\frac{x}{m}\pm a\sqrt{1+{{m}^{2}}}\]
B.	\[x+my=\pm \text{ }a\text{ }\sqrt{1+{{m}^{2}}}\]
C.	\[x+my=\pm a\sqrt{1+{{(1/m)}^{2}}}\]
D.	\[x-my=\pm a\sqrt{1+{{m}^{2}}}\]
Answer» C. \[x+my=\pm a\sqrt{1+{{(1/m)}^{2}}}\]

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Equation of the tangent to the circle \[{{x}^{2}}+{{y}^{2}}={{a}^{2}}\]which is perpendicular to the straight line \[y=mx+c\]is

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