Answer
x$^2$+y$^2$=9
Work Step by Step
(h,k)=(0,0)
r=3
(x-h)$^2$+(y-k)$^2$=r$^2$
(x-0)$^2$+(y-0)$^2$=3$^2$
x$^2$+y$^2$=9
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