find the curved surface area of cone of radius 2r and slant height 4r

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Please find below the solution to the asked query:

$$\begin{gathered} \mathrm{Radius}\left(\mathrm{R}\right)=2\mathrm{r} \\ \mathrm{Slannt} \mathrm{height}\left(\mathrm{L}\right)=4\mathrm{r} \\ \mathrm{Curved} \mathrm{surface} \mathrm{area}=\mathrm{\pi RL} \\ =\mathrm{\pi }\left(2\mathrm{r}\right)\left(4\mathrm{r}\right) \\ =\mathbf{8}{\mathbf{\pi r}}^{\mathbf{2}}\mathbf{ }\left(\mathbf{Answer}\right) \end{gathered}$$

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