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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