In this activity, we are going to calculate the volume of a sphere!
You will need a scientific calculator for this activity
A sphere is a ball.
Every point on the surface is the same distance from the centre. (The radius)
To find the volume we use this formula:
Volume = 4/3 x π x (radius)3
in short:
V = 4/3πr3
Let's look at a question.
Example
Calculate the volume of the sphere shown below in cm3 to 1 decimal place.
Answer
Radius, r = 4 cm
Volume = 4/3πr3 = 4 ÷ 3 x π x 43
Use the π button on your calculator!
V = 268.1 cm3 (1 dp)
Let's have a go at some questions now.