Question Number 71693 by TawaTawa last updated on 18/Oct/19
Answered by MJS last updated on 19/Oct/19
$$\mathrm{the}\:\mathrm{discs}\:\mathrm{are}\:\mathrm{cylinders} \\ $$$${V}=\pi{r}^{\mathrm{2}} {h} \\ $$$${V}=\pi×\mathrm{1}^{\mathrm{2}} ×\mathrm{1}+\pi×\mathrm{2}^{\mathrm{2}} ×\mathrm{1}+\pi×\mathrm{3}^{\mathrm{2}} ×\mathrm{1}=\mathrm{14}\pi \\ $$$${h}=\frac{{V}}{\pi{r}^{\mathrm{2}} }=\frac{\mathrm{14}\pi}{\pi×\mathrm{1}^{\mathrm{2}} }=\mathrm{14} \\ $$
Commented by TawaTawa last updated on 19/Oct/19
$$\mathrm{God}\:\mathrm{bless}\:\mathrm{you}\:\mathrm{sir} \\ $$