Radians

Definition

Radians are units used to measure angles in trigonometry. One radian is defined as an angle subtended by an arc equal in length to the radius of a circle.

Related terms

Degrees: Another unit used to measure angles commonly known and used outside of mathematics.

Unit Circle: A circle with a radius of 1 unit, used to understand the values of trigonometric functions for different angles.

Arc Length: The distance along an arc of a circle, measured in linear units.