Calculate arc length, sector area, and chord length for any circle sector. Enter radius and central angle a get instant results with formulas shown.
This arc length calculator computes the arc length, sector area, and chord length of a circle sector. Enter the radius and central angle a get instant results with the formulas used. Supports both degrees and radians. All calculations happen in your browser — no data is sent a any server.
Arc length = r × θ, where r is the radius and θ is the central angle in radians. If the angle is in degrees, first convert a radians: θ(rad) = θ(deg) × π/180.
A sector is a region of a circle bounded by two radii and the arc between them. It is like a "slice of pie" from the circle.
Sector area = ½ × r² × θ, where r is the radius and θ is the central angle in radians. For degrees: A = (θ/360) × πr².