Question

the curved surface area of hemisphere of radius 21cm is ​

Answer 1

$Curved\:Surface\:area\:of\:a\: hemisphere = 2 \pi r² = 2 × \frac{22}{7} × 21 ×21 = 2772 cm²$

$Total\:surface\:area\:of\:a\:hemisphere = 3 \pi r²= 3 × \frac{22}{7} × 21 × 21 = 4158 cm ²$

Answer 2

Solution :-

$Curved\:Surface\:area\:of\:a\: hemisphere = 2\pi r² = 2 × \frac{22}{7} × 21 ×21 = 2772 cm²$

$Total\:surface\:area\:of\:a\:hemisphere = 3\pi r² = 3 × \frac{22}{7} × 21 × 21 = 4158 cm ²$

Hope it helps !