Radian - Math.net
https://www.math.net/radian
WebA radian (sometimes indicated as "rad") is a unit of measurement for angles. It is used in many areas of mathematics, such as trigonometry, calculus and, more. Radian definition. A radian is a measurement of angle based on the radius of a circle. 1 radian is the angle that is subtended by an arc that has a length equal to the radius of the circle.
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