In a circle equation, for example (x-a)^2 + (y-b)^2 = r^2, is (a,b) the center of the circle? Or is it (-a,b)?
https://en.wikipedia.org/wiki/Circle
In an (x-y) Cartesian coordinate system, the circle with centre coordinates ( a , b ) and radius ‘r’ is the set of all points ( x , y ) such that
{\displaystyle (x-a)^{2}+(y-b)^{2}=r^{2}}
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