Question

a solid cylinder is to be painted, if the diameter of the cylinder is0.35m and the height of the cylinder is 60cm. cost of painting is 25p/cmsquare , find the cost to paint the total surface of the cylinder

Answer 1

Dear Student,

$$\begin{gathered} Radiusofcylinder=\frac{0.35}{2}=0.175m=17.5cm \\ Heightofcylinder=60cm \\ Totalsurfaceareaofcylinder=2\mathrm{\pi r}\left(\mathrm{h}+\mathrm{r}\right) \\ =2\times \frac{22}{7}\times 17.5\left(60+17.5\right) \\ =2\times \frac{22}{7}\times 17.5\times 77.5 \\ =8525{\mathrm{cm}}^2 \\ \mathrm{Total}\mathrm{cost}\mathrm{of}\mathrm{painting}=25\times 8525=213125\mathrm{paise}=\mathrm{Rs}.2131.25 \end{gathered}$$
Regards,