The center is:
To find the radius we can use the endpoints again to find the diameter squared and then get the radius from that:
d=√244, since d=2r, r=d/2
The equation of a circle is (x-h)^2+(y-k)^2=r^2. We found earlier that the center was at (-2,-4) and we just saw that r^2=61 so:
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