Answer:
The radius is 2 or The simplified radius is 4 ( if needed).
Step-by-step explanation:
- The equation of a circle is:
[tex](x-h)^2+(y-k)^2=r^2[/tex] where the center is [tex](h,k)[/tex], the point as [tex](x,y)[/tex] and the radius [tex]r^2[/tex].
-Put both the center and the point onto that equation:
[tex](0-2)^2+(1-1)^2=r^2[/tex]
-Then, solve them up:
[tex](0-2)^2+(1-1)^2 =r^2[/tex]
[tex](-2)^2+0=r^2[/tex]
[tex]4 + 0=r^2[/tex]
[tex]4 = r^2[/tex]
[tex]\sqrt{4} =\sqrt{r^2}[/tex]
[tex]2=r[/tex]
