Many people understand that there are 360 degrees in a circle but how many radians are there in a circle? What is a radian. The official definition for radian is “a unit of angle, equal to an angle at the center of a circle whose arc is equal in length to the radius.” Here is a visual of what a radian looks like: https://twitter.com/Sci_Phile/status/685874505344888832/photo/1

You’ll find that there are exactly 2 pi radians in a circle. That means one radian is approximately 57.3 degrees.