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Find the radius as the center of a circle whose equation is
3x2 + 3y2 + 18y -12x – 9=0 

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X2 + y2 – 4x+6y-3=0
X2-4x+4 + y2+6y +9=3+4+9
(x-2)2 +(y+3)2=16
Centre (2,-3) radius=4

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