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If a circle whose center is (1,-3) touch...

If a circle whose center is `(1,-3)` touches the line `3x-4y-5=0` , then find its radius.

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The correct Answer is:
2
Radius`=`Perpendicular distance form `(1,-3)` to `(3x-4y-5=0)=|(3+12-5)/(sqrt((5)^(2)))|=2`
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