If one of the diameters of the circle x^...

If one of the diameters of the circle `x^2+y^2-2x-6y+ 6 = 0` is a chord to the circle with centre (2, 1), then the radius of circle is:

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`x^2+y^2-2x-6y+6=0`
`x^2+y^2+2gx+2fy+1=0`
g=-1 and f=-3
centre(-g,-f)`->`centre(1/3)
`/_o o'A cong /_o o'B`
OA=OB
`OO'=OO'`
`O'A=O'B`
...

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