Insert the information in the form and the calculator will determine the central angle of a circle.

What is the central angle of a circle?

The central angle of a circle is the angle whose apex is the center O of a circle and whose legs are radii intersecting the circle in two distinct points A and B. Central angles are subtended by an arc between those two points. And the arc length is the central angle of a circle of radius one.

How to calculate central angle of a circle?

To calculate central angle of a circle you should use the following formula:
Φ = s / r
where:
Φ = central angle
s = arc length
r = radius

Why use central angle of a circle?

The central angle of a circle is used in order to divide a circle into sectors.