Finding the Volume of a Sphere
(KS3, Year 8)
The LessonThe volume of a sphere is found using the formula:
In this formula, r is the radius of the sphere. The image below shows what we mean by radius:
"Find the Volume" Widget
- Click on the shape you're learning about.
- Click on the pad to start.
- Follow the instructions in the bottom-left corner.
- On the last click, the formula, workings, and answer will appear in the yellow box.
- Good luck!
How to Find the Volume of a Sphere
QuestionWhat is the volume of a sphere with a radius of 5 cm, as shown below?
Start with the formula:
Volume = 4πr3 ⁄ 3Don't forget: π is pi (≈ 3.14) and r3 = r × r × r (r cubed) and ⁄ means ÷.
Substitute the radius into the formula. In our example, r = 5.
Volume = 4 × π × 53 ⁄ 3 Volume = 4 × π × 125 ÷ 3 Volume = 4 × 3.14 × 125 ÷ 3 Volume = 523.3 cm3
Answer:The volume of the sphere with a radius of 5 cm is 523.3 cm3.
Lesson SlidesThe slider below shows another real example of how to find the volume of a sphere. Open the slider in a new tab
What Is a Sphere?A sphere is a ball-shaped object. Each point on its surface is the same distance away from the center.
The Main Parts of a SphereThe radius is the distance from the center of a sphere to its surface. The diameter is the line that goes through the center of the sphere and joins two opposite points on the surface. It is twice the length of the radius.
Who Discovered How To Find the Volume of a Sphere?Archimedes discovered was the first to prove the volume of a sphere.
A Sphere in a CylinderIf a sphere is placed in a cylinder, the volume of the sphere is exactly two-thirds the volume of the cylinder. Can you work out why?
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