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what is the center ang radius
) x2 + y2 = 49
:) (x - 3)2 + y2 = 4
:) x2 + (y + 6) = 9
:) x2 + y2 + 14x - 4y + 4 = 0
x2 + y2 - 8x - 2y - 8 = 0