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S=(x,y)
x=1/2*(-5+3)=-1
y=1/2*(-2+0)=-1
S=(-1,-1)
|AS|²=(3+1)²+(2+1)²=16+9=25
|AS|=5
2.
S=(a,b)
a=1/2*(3-5)=-1
b=1/2*)-1+1)=0
S=(-1,0)
r²= |AS|²=(-1-3)²+(0-1)²=16+1=17
(x+1)²+y²=17