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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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