a) S=(−3;4) r=1/3
(x+3)^2+(y-4)^2=1/9
b) S=(0;−1) r=2
x^2+(y+1)^2=4
c) S=(√2 ; − √7 ) r=7
(x-√2)^2+(y+√7)^2=49
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a) S=(−3;4) r=1/3
(x+3)^2+(y-4)^2=1/9
b) S=(0;−1) r=2
x^2+(y+1)^2=4
c) S=(√2 ; − √7 ) r=7
(x-√2)^2+(y+√7)^2=49