The total surface area of a solid hemisphere is 1848 cm²…

The lateral surface of a cuboid is $2(a + b)c$ and its total surface is $2(ab + bc + ca)$. A cylinder has curved surface $2\pi r h$ and total surface $2\pi r(r + h)$. A cone has $l = \sqrt{r^2 + h^2}$, curved surface $\pi r l$ and total surface $\pi r(r + l)$. A hemisphere has curved surface $2\pi r^2$ and total surface $3\pi r^2$.