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S=(a,b)
a=1/2*(-7+5)=-1
b=1/2*(8-4)=2
d=2r
d²=(5+7)²+(-4-8)²=144+144
d=12√2
r=6√2
r²=36*2=72
Odp. (x+1)²+(y-2)²=72