Question 846281
{{{x[c]=(x[1]+x[2]+x[3])/3=(-1+5+5)/3=9/3=3}}}
{{{y[c]=(y[1]+y[2]+y[3])/3=(2+6-2)/3=6/3=2}}}
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{{{drawing(300,300,-4,10,-4,10,grid(1),
circle(-1,2,0.25),
circle(5,6,0.25),
circle(5,-2,0.25),
circle(3,2,0.35),
line(-1,2,5,6),
line(5,6,5,-2),
line(5,-2,-1,2))}}}