Segment of a Circle Area Calculator

Find the area of a circular segment from its radius and central angle.

Radius

Angle (degrees)

Result

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How it works

Area = ½ r² (θ − sin θ), θ in radians

Frequently Asked Questions

What is the formula?

Area = ½ r² (θ − sin θ), θ in radians

What units should I use?

Use any single unit for all inputs. The area result is in that unit squared, and volume is in that unit cubed.