1) (x-1)^2+(y-2)^2 <= 25
2) (x+2)^2+(y-2)^2>=49
3) x^2+(y-2.5)^2<9
4) (x-3.5)^2+y^2>1
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Answers & Comments
1) (x-1)^2+(y-2)^2 <= 25
2) (x+2)^2+(y-2)^2>=49
3) x^2+(y-2.5)^2<9
4) (x-3.5)^2+y^2>1