Radian (Noun)
Meaning
The unit of plane angle adopted under the Systeme International d'Unites; equal to the angle at the center of a circle subtended by an arc equal in length to the radius (approximately 57.295 degrees).
Classification
Nouns denoting quantities and units of measure.
Examples
- The radian is a unit of angular measurement that is widely used in mathematics and physics.
- One radian is the angle subtended at the center of a circle by an arc equal in length to the radius of the circle.
- The angle of a sector of a circle is often measured in radians, rather than degrees.
- To convert degrees to radians, you can multiply the angle in degrees by pi and divide by 180.
- In calculus, the radian is the standard unit of angular measurement, and is used to define the trigonometric functions.