Answer :

naǫ
[tex]C=2 \pi r[/tex]
C - circumference, r - radius

[tex]C=35 \ [cm] \\ \\ 35=2 \pi r \\ r=\frac{35}{2 \pi} \\ r=\frac{17.5}{\pi} \\ \boxed{r \approx 5.57 \ [cm]}[/tex]
konrad509
[tex]C=2\pi r=35\\ 2\pi r=35\\ r=\dfrac{35}{2\pi}\approx5.57\text{ cm}[/tex]