Formel V= Pi x d³ : 6
d = ?
\(\begin{array}{rcll} V &=& \dfrac{ \pi \cdot d^3 }{6} \quad & | \quad \cdot 6 \\\\ 6V &=& \pi \cdot d^3 \quad & | \quad :\pi \\\\ \dfrac{6V}{\pi} &=& d^3\\\\ d^3 &=& \dfrac{6V}{\pi} \quad & | \quad \sqrt[3]{} \\\\ d &=& \sqrt[3]{ \dfrac{6V}{\pi} } \end{array}\)