[tex]x {}^{2} - 2x + y {}^{2} = 0 \\ [/tex]
[tex]x {}^{2} - 2x + 1 + y {}^{2} = 0 + 1[/tex]
[tex]x {}^{2} - 2x + 1 = (x - 1) {}^{2} \\ (x - 1) {}^{2} + y {}^{2} = 1[/tex]
[tex](x - 1) {}^{2} + (y - 0) {}^{2} = 1 {}^{2} [/tex]
[tex]\boxed{r = 1}[/tex]
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[tex]x {}^{2} - 2x + y {}^{2} = 0 \\ [/tex]
[tex]x {}^{2} - 2x + 1 + y {}^{2} = 0 + 1[/tex]
[tex]x {}^{2} - 2x + 1 = (x - 1) {}^{2} \\ (x - 1) {}^{2} + y {}^{2} = 1[/tex]
[tex](x - 1) {}^{2} + (y - 0) {}^{2} = 1 {}^{2} [/tex]
Таким образом ответ:
[tex]\boxed{r = 1}[/tex]
Ответ: 4) 1