Question

find the total surface area of a hemisphere with radius as 3 cm​

Answer 1

$$\begin{gathered} \mathrm{Let}\mathrm{r}\mathrm{be}\mathrm{the}\mathrm{radius}\mathrm{of}\mathrm{the}\mathrm{hemisphere}. \\ \mathrm{Now},\mathrm{r}=3\mathrm{cm} \\ \mathrm{TSA}\mathrm{of}\mathrm{hemisphere}=3{\mathrm{\pi r}}^2 \\ =3\times \frac{22}{7}\times 3\times 3 \\ =\frac{594}{7} \\ =84.86{\mathrm{cm}}^2\left(\mathrm{approx}.\right) \end{gathered}$$