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The standard equation for a circle is `(x-h)^2+(y-k)^2=r^2` where (h,k) is the center of the circle, and r is the radius.
Given `x^2+y^2=49` we could write as `(x-0)^2+(y-0)^2=7^2` so the center is at the origin (0,0) and the radius is 7.
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