Unit rad
Name radian
Category Angle
Details A radian (rad) is a unit of measurement used to determine the angle in the field of mathematics and physics, particularly in the study of trigonometry, calculus, and circular motion. Unlike degrees, which divide a circle into 360 equal parts, radians express angles as a ratio of the arc length to the radius of the circle. In essence, an angle in radians quantifies how much a point has "traveled" around the circle relative to its radius.

One radian is defined as the angle formed when the arc length of the circle is equal to the radius of that circle. In terms of degrees, one radian is approximately equal to 57.2958 degrees. Since a full circle has an arc length equal to the circle's circumference (2π times the radius), there are 2π radians in a complete circle or revolution (approximately 6.2832 radians).

Radians are extensively used in various fields such as engineering, physics, and other sciences because they have several mathematical advantages and simplifications over degrees when working with trigonometric functions, calculus, and other mathematical operations.