Przypomnijmy:

Nierówność (x-x_s)²+(y-y_s)² ≤ r² opisuje koło o środku S(x_s,y_s) i promieniu r, gdzie r>0. 

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a) 

${\left(x-1\right)}^2+{\left(y+3\right)}^2\le {\sqrt{2}}^2$  

${\left(x-1\right)}^2+{\left(y+3\right)}^2\le 2$  

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b) 

${\left(x+4\right)}^2+{\left(y-\sqrt{2}\right)}^2\le {\left(\frac{1}{2}\right)}^2$  

${\left(x+4\right)}^2+{\left(y-\sqrt{2}\right)}^2\le \frac{1}{4}$  

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c)

${\left(x-2\right)}^2+{\left(y+5\right)}^2\le 6^2$  

${\left(x-2\right)}^2+{\left(y+5\right)}^2\le 36$