Work Step by Step
$(x-h)^2+(y-k)^2=r^2$ $h=0$, $k=0$ and $r=3$: $(x-0)^2+(y-0)^2=3^2$ $x^2+y^2=9$
You can help us out by revising, improving and updating this answer.Update this answer
After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.