how do find equation of circle with radius r and center (a, b)

Question : Find equation of circle with (a) radius 1 and center (1, 1) (b) radius 1 and center (1, -1) Solution (a) : We know that Equation of circle with radius r and center (a, b) is \[\left(x-a\right)^2+\left(y-b\right)^2=\left(r\right)^2 \]…

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