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# The radius of a circle with it's center at $(2,1)$ and whose one chord is the diameter of the circle $x^2+y^2-2x-6y+6=0$ is:

(A) r = 4 $\quad$ (B) r = 9 $\quad$ (C) r = 3 $\quad$ (D) r = 6

Equation of circle $=x^2+y^2+2gx+2fy+c=0$
Now consider a circle having (h,k) as centre and radius a, Equation of this circle is $(x-h)^2+(y-k)^2=a^2$