How it works
Calculate the straight chord joining two points on a circle. The smaller central angle ranges from 0 to 180 degrees.
c = 2r sin(θ/2)
Worked example
Show example inputs and result
Radius: 5 · Central angle: 60.
- Chord length
- 5
Questions and answers
Why are some results rounded?
Results display up to 8 decimal places. Calculations use the unrounded values; very small values use scientific notation. JavaScript floating-point arithmetic can introduce tiny rounding differences.
Are my inputs sent to a server?
The calculator processes inputs in your browser. Its code does not send your values to a server.
Method reviewed: October 8, 2026 · Methods & accuracy