Answer
Center: $(0,0)$; Radius: $5$
Work Step by Step
$(x-h)^2+(y-k)^2=r^2$ (standard form)
Center: $(h,k)$; Radius: $r$
$x^2+y^2=25$
$(x-0)^2+(y-0)^2=5^2$
$h=0$, $k=0$ and $r=5$
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