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The pole of a straight line with respect...

The pole of a straight line with respect to the circle `x^(2)+y^(2)=a^(2)` lies on the circle `x^(2)+y^(2)=9a^(2)`. If the straight line touches the circle `x^(2)+y^(2)=r^(2)`, then

A

`9a^(2)=r^(2)`

B

`9r^(2)=a^(2)`

C

`r^(2)=a^(2)`

D

`3r^(2)=a^(2)`

Text Solution

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The correct Answer is:
B
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