Question

Find (1) The CSA and (ii) The TSA of the hemisphere of radius 21 cm​

Answer 1

$\huge\sf \orange{solution}$

$\sf{1}. \: \: \: 4\pi {r}^{2} = 4 \times \frac{22}{7} \times 21\times 21 {cm}^{2} \\ \\ = \sf{\boxed{2772 {cm}^{2} }}$

$\sf{2. \: \: 3\pi {r}^{2} = 3 \times \frac{22}{7} \times 21 \times 21 {cm}^{2} } \\ \\ = \sf{ \boxed{4158 {cm}^{2}}}$