Find the total surface area of a cone of slant height '2l' and radius 'r/2'.
cone = $$\pi\times r\times l +\pi\times r^2  $$
Given
Radius = $$\frac{r}{2}$$
So Slant height=2L
cone = $$\pi\times r\times l +\pi\times r^2 $$
cone = $$\pi\times \frac{r}{2}\times 2L +\pi\times \frac{r}{2}^2 $$
$$\pi r(l + (r/4))$$
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