S.158 T.427


\pi x^2=1000:10
\pi x=100
x^2=31{,}8309...
x=5{,}6418...\approx5{,}6\left(cm\right)
2\pi x=2\pi\cdot5{,}6=35{,}185...\approx35\left(cm\right)
V:\ 35\cdot10