Question

find the volume of hollow sphere whose outer diameter is 10 centimetre and the thickness of the material of which it is made is 1 cm<br />

Answer 1

4 pi /3(5^3-4^3)=(244/3)pi

Answer 2

$volume \: = \frac{4}{3} \pi {r}^{3} \\ = \frac{4}{3} \times \frac{22}{7} \times 4 \times 4 \times 4 \\ = \frac{64 \times 22}{21} = 67.04$