How it works
Arc length = radius × angle in radians = radius × angle in degrees × π/180.
Input definitions
- Radius
- Enter the value in the labeled unit.
- Angle swept (degrees)
- Enter the value in the labeled unit.
A worked example
- Radius
- 3
- Angle swept (degrees)
- 180
Assumptions & limits
Uses the units and scope stated in the input labels. Results are rounded for display; verify the model is appropriate for your situation.
Sources & review
Maintained by AnsRio. Methods and examples use automated checks; this does not imply independent professional certification.
Method updated 2026-10-18. Content checked against the stated method and examples. Our verification approach.
Common questions
Can the angle exceed one full turn?
Yes. Angles above 360 degrees describe a path covering more than one rotation, rather than a distinct single arc.
How does Circular arc length work?
Arc length = radius × angle in radians = radius × angle in degrees × π/180.
What should I check before using Circular arc length?
Uses the units and scope stated in the input labels. Results are rounded for display; verify the model is appropriate for your situation.