![image](https://tex.z-dn.net/?f=V%3D+%5Cfrac%7B4%7D%7B3%7D+%5Cpi+R%5E3%3D8+%5C%5C++%5Cpi+R%5E3%3D6+%5C%5C+R%3D+%5Csqrt%5B3%5D%7B6%2F+%5Cpi+%7D+%5C%5C+S%3D4+%5Cpi+R%5E2%3D4+%5Cpi+++%5Csqrt%5B3%5D%7B36%2F+%5Cpi%5E2+%7D+%5C%5C+S_%7Btkani%7D%3Dab%3Da%2A2%3D4+%5Cpi+++%5Csqrt%5B3%5D%7B36%2F+%5Cpi%5E2+%7D+%3D%3E+%5C%5C+b%3D2+%5Cpi+++%5Csqrt%5B3%5D%7B36%2F+%5Cpi%5E2+%7D)
\\ b=2 \pi \sqrt[3]{36/ \pi^2 }" alt="V= \frac{4}{3} \pi R^3=8 \\ \pi R^3=6 \\ R= \sqrt[3]{6/ \pi } \\ S=4 \pi R^2=4 \pi \sqrt[3]{36/ \pi^2 } \\ S_{tkani}=ab=a*2=4 \pi \sqrt[3]{36/ \pi^2 } => \\ b=2 \pi \sqrt[3]{36/ \pi^2 }" align="absmiddle" class="latex-formula">