Question 874074
{{{-2x-33+2y^2=-2x^2-6y}}}
{{{2x^2-2x+2y^2+6y=33}}}
{{{x^2-x+y^2+3y=33/2}}}
{{{(x^2-x+1/4)+(y^2+3y+9/4)=33/2+1/4+9/4}}}
{{{(x-1/2)^2+(y+3/2)^2=66/4+1/4+9/4}}}
{{{(x-1/2)^2+(y+3/2)^2=19}}}
Center : ({{{1/2}}},{{{-3/2}}})
{{{R=sqrt(19)}}}
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{{{drawing(300,300,-6,6,-8,4,grid(1),blue(circle(1/2,-3/2,sqrt(19))))}}}}