Solution:
The total surface area of a cone is expressed as
[tex]\begin{gathered} Total\text{ surface area = curved surface area +area of circular base} \\ where \\ curved\text{ }surface\text{ }area\text{ = }\pi rl \\ area\text{ }of\text{ }circular\text{ }base\text{ = }\pi r^2 \\ \therefore \\ Total\text{ surface area=}\pi rl+\pi r^2 \\ =\pi r(l+r) \end{gathered}[/tex]
From the given options, the correct formulas are:
