Question

The curved surface area of a hemisphere of radius 21 cm is: (a) 2772 cm* (b) 2564 cm* (c) 3772 cm* (d) 4772 cm​

Answer 1

Answer:

2772 cm is answer i hope it's helpful

Answer 2

Answer:

CSA of a hemisphere = 2πr^2

$= 2 \times \frac{22}{7} \times {21}^{2} \\ = \frac{44}{7} \times 21 \times 21 \\ = 44 \times 3 \times 21 = 2772$