What are respectively the curved surface area and volume of a hemisphere of radius 21 cm? (Take $π =\frac{22}{7}$)

2772 cm², 1940 cm³

We know that,

C.S.A of the hemisphere = 2πr². 

Volume of the hemisphere = \(\frac{2}{3}\)πr³

We have,

Radius of the hemisphere = 21 cm.

C.S.A of the hemisphere = 2 × \(\frac{22}{7}\)× (21)² = 2772 cm².

Volume of the hemisphere = \(\frac{2}{3}\) × \(\frac{22}{7}\) × (21)³ = 19404 cm³