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S=(0;0) r=1
b)(x-1)²+y²=9/2
S=(1;0) r=3/√2=3√2/2
c)x²+(y+2)²=16
S=(0;-2) r=4
d)(x-4)²+(y+2)²=8
S=(4;-2) r=√8=2√2
e)(1+x)²+(2-y)²=25
(x+1)²+(-(y-2))²=25
(x+1)²+(y-2)²=25
S=(-1;2) r=5
f)(-x-3)²+(-1-y)²=81
(-(x+3))²+(-(y+1))²=81
(x+3)²+(y+1)²=81
S=(-3;-1) r=9