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

The line 2x - y + 1 = 0 is tangent to the circle at the point (2,5) and the centre of the circles lies on x-2y = 4. The radius of the circle is :

A

`3sqrt(5)`

B

`5sqrt(3)`

C

`2sqrt(5)`

D

`5sqrt(2)`

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The correct Answer is:
A
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