How it works
Sector area = π × radius² × central angle / 360 for angles from zero through 360 degrees.
Input definitions
- Radius
- Enter the value in the labeled unit.
- Central angle (degrees)
- Enter the value in the labeled unit.
A worked example
- Radius
- 3
- Central angle (degrees)
- 90
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
Is the angle measured in radians?
No. Enter degrees from 0 to 360; the output is in square units of the entered radius.
How does Circular sector area work?
Sector area = π × radius² × central angle / 360 for angles from zero through 360 degrees.
What should I check before using Circular sector area?
Uses the units and scope stated in the input labels. Results are rounded for display; verify the model is appropriate for your situation.