Center: $(0,8)$; Radius: $r=9$
Work Step by Step
Equation of a circle: $(x-h)^2+(y-k)^2=r^2~~ $ (standard form) Center: $(h,k)$; Radius: $r$ $x^2+(y-8)^2=81$ $(x-0)^2+(y-8)^2=9^2$ $h=0$, $k=8$, $r=9$
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