EXPLANATION
The equation of a circle with center = (h,k) and radius r is the following:
[tex](x-h)^2+(y-k)^2=r^2[/tex]We have a center at (2,8) and radius = 10/2=5
Thus, the equation if the circle is the following:
[tex](x-2)^2+(y-8)^2=25\text{ \lbrack EQUATION OF THE CIRCLE\rbrack}[/tex]