What are respectively the curved surface area and volume of a hemisphere of radius 21 cm? (Take $π =\frac{22}{7}$)
Answer & explanation
Correct answer: option 1
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