Circumference of a Circle
Circumference of a Circle
\[C = 2\pi r\]
Variables
C = circumference (m)
r = radius (m)
Description
What is this formula?
This formula calculates the circumference of a circle from its radius. The circumference is the total distance around the circle.
When to use it
Use this formula when the radius of a circle is known and the perimeter or boundary length needs to be determined.
Example
If the radius of a circle is 5 m:
C = 2π(5) = 31.416 m
Applications
- Geometry and mathematics
- Engineering design
- Construction and architecture
- Mechanical components
- Circular motion calculations
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