1.

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

Answer»

`9A^(2)=R^(2)`
`9r^(2)=a^(2)`
`r^(2)=a^(2)`
`3r^(2)=a^(2)`

ANSWER :B


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