Question

the radius and the vertical height of a cone are 5cm and12cmrespectivaely. find the csa

Answer 1

$$\begin{gathered} \mathrm{Let}\mathrm{the}\mathrm{cone}\mathrm{of}\mathrm{radius}r\mathrm{and}\mathrm{slant}\mathrm{height}l \\ r=5cm,h=12cm \\ l=\sqrt{r^2+h^2}=\sqrt{25+144}=\sqrt{169}=13 \\ \mathrm{CSA}=\pi rl=\frac{22}{7}\times 5\times 13=204.28{\mathrm{cm}}^2 \end{gathered}$$