Question 366780
x^2 + y^2 - 6x - 10y + 30 = 0
..
x^2-6x +y^2-10y+30=0
(x^2-6x+9)-9+(y^2-10y+25)-25+30=0
(x-3)^2+(y-5)^2-9-25+30=0
(x-3)^2+(y-5)^2=9+25-30
(x-3)^2+(y-5)^2=4
Center = (3,5) 
sum = 8
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