Finding the Diameter from the Circumference
(KS3, Year 7)
How to Find the Diameter from the Circumference
Finding the diameter from the circumference is easy.Question
What is the diameter of the circle, with circumference 30 cm, below?Step-by-Step:
1
Start with the formula:
Diameter = C⁄π
Don't forget: / means ÷ and π is pi (≈ 3.14)
2
Substitute the circumference into the formula. In our example, C = 30.
Diameter = 30⁄π
Diameter = 30 ÷ π
Diameter = 30 ÷ 3.14
Diameter = 9.6 cm
Answer:
The diameter of the circle is 9.6 cm.Interactive Widget
Here is an interactive widget to help you learn about finding the diameter of a circle from its circumference.Worksheet
This test is printable and sendable