\[\boxed{\mathbf{959.ОК\ ГДЗ - домашка\ на}\ 5}\]
\[\textbf{а)}\ x^{2} + y^{2} = 9\ \Longrightarrow \ O(0;0);\]
\[R = 3:\]
\[\textbf{б)}\ (x - 1)^{2} + (y + 2)^{2} = 4\ \Longrightarrow \ \ \]
\[\Longrightarrow O(1; - 2);R = 2:\]
\[\textbf{в)}\ (x + 5)^{2} + (y - 3)^{2} = 25\ \Longrightarrow\]
\[\Longrightarrow \ O( - 5;3);R = 5:\]
\[\textbf{г)}\ (x - 1)^{2} + y^{2} = 4\ \Longrightarrow O(1;0);\]
\[R = 2:\]
\[\textbf{д)}\ x^{2} + (y + 2)^{2} = 2\ \Longrightarrow\]
\[\Longrightarrow O(0; - 2);R = \sqrt{2}\mathbf{:\ }\]