What is the diameter of circle x2 + y2 - 2x - 2y - 7 = 0?
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radius of cicle x^2+y^2+2gx+2fy+c=0 is whole √g^2+f^2-c
g=1,f=1c=-7
√1+1+7=√9=3
radius =3 diameter =2(3)=6units
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