A transformation $$\(T\)$$ from the $$\(z\)$$-plane, where $$\(z=x+\mathrm{i} y\)$$, to the $$\(w\)$$-plane, where $$\(w=u+\mathrm{i} v\)$$ is given by $$\[ w=\frac{z-3}{2 \mathrm{i}-z} \quad z \neq 2 \mathrm{i} \]$$ The line in the $$\(z\)$$-plane with equation $$\(y=x+3\)$$ is mapped by $$\(T\)$$ onto a circle $$\(C\)$$ in the $$\(w\)$$-plane. Determine (i) the coordinates of the centre of $$\(C\)$$ (ii) the exact radius of $$\(C\)$$ (8)

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