\[1)\ |z| = 3\]
\[x_{0} = 0;\text{\ \ \ }y_{0} = 0;\ \ \ R = 3;\]
\[2)\ |z| = 5\]
\[x_{0} = 0;\text{\ \ \ }y_{0} = 0;\ \ \ R = 5;\]
\[3)\ |z - 2i| = 1\]
\[x_{0} = 0;\text{\ \ \ }y_{0} = 2;\ \ \ R = 1;\]
\[4)\ |z + 3i| = 2\]
\[x_{0} = 0;\text{\ \ \ }y_{0} = - 3;\ \ \ R = 2;\]