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The line 3x-2y=k meets the circle x^(2)+...

The line `3x-2y=k` meets the circle `x^(2)+y^(2)=4r^(2)` at only one point if `k^(2)=`

A

`52r^(2)`

B

`20r^(2)`

C

`(20)/(9)r^(2)`

D

`(52)/(9)r^(2)`

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The correct Answer is:
A
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