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What (who) is radian measure - definition
SI UNIT OF ANGULAR MEASURE
Microradian; Radian measure; ㎭; Nanoradian; Raidans; Radians; RAD (calculator mode); Unit angle; Radian (angle); Radian unit
![Some common angles, measured in radians. All the large polygons in this diagram are [[regular polygon]]s.](https://commons.wikimedia.org/wiki/Special:FilePath/Radian-common.svg?width=200 "Some common angles, measured in radians. All the large polygons in this diagram are [[regular polygon]]s.")
radian
['re?d??n]
¦ noun a unit of measurement of angles equal to about 57.3°, equivalent to the angle subtended at the centre of a circle by an arc equal in length to the radius.
Radian
The angle whose arc is equal in length to the radius; the unit angle.
Radian
·noun An arc of a circle which is equal to the radius, or the angle measured by such an Arc.
Wikipedia
Radian
The radian, denoted by the symbol rad, is the unit of angle in the International System of Units (SI) and is the standard unit of angular measure used in many areas of mathematics. The unit was formerly an SI supplementary unit (before that category was abolished in 1995). The radian is defined in the SI as being a dimensionless unit, with 1 rad = 1. Its symbol is accordingly often omitted, especially in mathematical writing.
