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radian

mathematics

Also known as: rad, radian measure

Learn about this topic in these articles:

steradians

In steradian
…solid and the English word radian, a steradian is, in effect, a solid radian; the radian is an SI unit of plane-angle measurement defined as the angle of a circle subtended by an arc equal in length to the circle’s radius.
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trigonometry

In trigonometry: Trigonometric functions
…are the degree and the radian. There are 360° in a complete revolution, with each degree further divided into 60′ (minutes) and each minute divided into 60″ (seconds). In theoretical work, the radian is the most convenient unit. It is the angle at the centre of a circle that intercepts…
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