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The line 2x-y+1=0 is tangent to the circ...

The line `2x-y+1=0` is tangent to the circle at the point (2, 5) and the center of the circle lies on `x-2y=4.` The radius of the circle is `3sqrt(5)` (b) `5sqrt(3)` (c) `2sqrt(5)` (d) `5sqrt(2)`

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