Video: Finding the Volume of a Sphere

Work out the volume of the sphere, giving your answer accurate to two decimal places.

01:14

Video Transcript

Work out the volume of the sphere, giving your answer accurate to two decimal places.

The volume of any sphere is equal to four-thirds 𝜋𝑟 cubed, where 𝑟 is the radius of the sphere. We can see from our diagram that the radius in this case is 3.6 units. We can therefore calculate the volume by multiplying four-thirds by 𝜋 by 3.6 cubed. Typing this into the calculator gives us 195.4321 and so on.

We are asked to give our answer to two decimal places. This means that the deciding number is the two in the thousandths column. If the deciding number is less than five, we round down. So this answer rounds to 195.43. As there are no units given in the question, we can say that the volume of the sphere is 195.43 cubic units.

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