The equation of the normal to the circle ${x^2} + {y^2} = 9$ at the point $\left( {\frac{1}{{\sqrt 2 }},\frac{1}{{\sqrt 2 }}} \right)$ is
The equation of the normal to the circle ${x^2} + {y^2} = 9$ at the point $\left( {\frac{1}{{\sqrt 2 }},\frac{1}{{\sqrt 2 }}} \right)$ is
- A
$x + y = 0$
- B
$x - y = \frac{{\sqrt 2 }}{3}$
- C
$x - y = 0$
- D
None of these
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- [IIT 1985]
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