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The volume is calculated using  \begin{align*}  V &= \pi r^2h\\  &= \pi\frac{\text{Diameter}^2}{4}\times\text{Thickness}\\ \pi\times(\frac{\text{Diameter}^2}{4})\times\text{Thickness}\\  \delta V &= V(\frac{2\delta D}{D} + \frac{\delta Th}{Th})  \end{align*}  and so the density $\rho$ is given by