In this formula, C is the circumference of the circle. The image below shows what we mean by finding the diameter from the circumference:
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.
This page was written by Stephen Clarke.
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