Solve {l}{r^{2}=(3-x_{m})^{2}+(0-y_{m})^{2}}{r^{2}=(-3-x_{m})^{2}+(0-y_{m})^2}{r^2=(-2-x_{m})^2+(2-y_{m})^2}

$$\left. \begin{array} { l } { r ^ { 2 } = ( 3 - x _ { m } ) ^ { 2 } + ( 0 - y _ { m } ) ^ { 2 } } \\ { r ^ { 2 } = ( - 3 - x _ { m } ) ^ { 2 } + ( 0 - y _ { m } ) ^ { 2 } } \\ { r ^ { 2 } = ( - 2 - x _ { m } ) ^ { 2 } + ( 2 - y _ { m } ) ^ { 2 } } \end{array} \right.$$

Solve for r, x_m, y_m

$$r=-\frac{\sqrt{145}}{4}\approx -3.010398645\text{, }x_{m}=0\text{, }y_{m}=-\frac{1}{4}=-0.25$$

$$r=\frac{\sqrt{145}}{4}\approx 3.010398645\text{, }x_{m}=0\text{, }y_{m}=-\frac{1}{4}=-0.25$$