noun
- plural of radian: units of angular measurement equal to the angle subtended at the center of a circle by an arc whose length equals the radius
Usage: mathematics; geometry
Examples
- The angle measures 2.5 radians.
- Convert 180 degrees to radians.
- A full circle contains 2π radians.
- The formula uses angles measured in radians.
- Trigonometric functions often require input in radians.
- One radian equals approximately 57.3 degrees.