Android app on Google Play

Circle sector

A circle sector is a part of circle defined by the circle’s periphery (the edge) and an angle formed by two radiuses.

Drawing of a circle sector

Arc length

Use the following formula to calculate the arc length:

S=r*theta

Where θ is the angle at the center point in radians and r is the radius.

Area

The area of the circle sector can be calculated with the formula:

A=frac{r^2*theta}{2}

where θ is the angle at the center point in radians and r is the radius.

Calculate area and arc length of a circle sector

Radius (r): 
Angle (θ) in radians: