A radian () is the angle () which subtends an arc equal to the length of the radius of a circle and the SI unit of angles. The angle of a circle is radians.
Convert Between Radians and Degrees
Given there are in a circle and in a circle, we can say .
You can solve for either side of the equation to determine the formula for conversion.
Video: Intro to Radians
Resources to Learn About Radians
Deeper Knowledge on Radian
The basics of angular motion
Broader Topics Related to Radian
The mathematics of circles
Fun with numbers