anyone know about least squares?

Jul 12, 2001
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knowing that the equation for a circle is (x-xO)^2+(y-yO)^2=r^2 where (xO and yO) is the center. how can u use least squares to derive xO, yO, and r?

i can start off i think by taking the derivitives first in respect to xO then yO then r...but then i get stuck