Question

CSA of a right circular cylinder is 8.8msquare .if its radius of the base of the cylinder is 0.7m.find its height

Answer 1

$$\begin{gathered} \mathrm{Let}\mathrm{r}\mathrm{be}\mathrm{the}\mathrm{radius}\mathrm{of}\mathrm{base}\mathrm{and}\mathrm{h}\mathrm{be}\mathrm{the}\mathrm{height}\mathrm{of}\mathrm{cylinder}. \\ \mathrm{Now},\mathrm{r}=0.7\mathrm{m};\mathrm{h}=? \\ \mathrm{CSA}=8.8{\mathrm{m}}^2 \\ \Rightarrow 2\mathrm{\pi rh}=8.8 \\ \Rightarrow 2\times \frac{22}{7}\times 0.7\times \mathrm{h}=8.8 \\ \Rightarrow 4.4\mathrm{h}=8.8 \\ \Rightarrow \mathrm{h}=\frac{8.8}{4.4} \\ \Rightarrow \mathrm{h}=2 \\ \mathrm{So},\mathrm{height}\mathrm{of}\mathrm{cylinder}=2\mathrm{m} \end{gathered}$$