\begin{align} &\cssId{Step1}{V = π·{d^{2}\over{4}}·s}\\[3px] &\cssId{Step2}{V = π·{d^{2}\over{4}}·s·n_{c}}\\[3px] &\cssId{Step3}{V = π·{({83\over{10}})^{2}\over{4}}·({91\over{10}})·6 =2954,192cm^{3}}\\[3px] \end{align}