Найдите координаты центра окружности и её радиус, если известно уравнение окружности :
а) (х + 2)^2 + y^2 = 9 ;
б) x^2 + (y - 4)^2 = 8 ;
в) (x - 5)^2 + (y + 7)^2 = 16 .
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