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

Answer 1

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

Answer 2

Given:

Outer diameter = 10 cm

Thickness = 1 cm

Find Inner diameter:

Inner Diameter = 10 - 1 - 1 = 9 cm

Find Radius:

$\boxed {\text {Radius = Diameter } \div \text {2}}$

Radius = 9 ÷ 2 = 4.5cm

Find Volume:

$\boxed {\text {Volume = } \dfrac{4}{3}\pi r^3 }$

$Volume = \dfrac{4}{3} \pi (4.5)^3 = 381.70 \text{ cm}^3 \text{ (nearest hundredth)}}$

Answer: 381.70 cm³