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The line 2x-y+1=0 touches a circle at th...

The line `2x-y+1=0` touches a circle at the point (2, 5) and the centre of the circle lies on `x-2y=4`. The diameter (in units) of the circle is

A

`6sqrt5`

B

`10sqrt3`

C

`4sqrt5`

D

`10sqrt2`

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A
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