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SI plane angle measure. Symbol: rad. It is the angle of a circle subtended by an arc equal in length to the circle's radius. Another definition is: the plane angle between two radii of a circle which cut off on the circumference an arc equal in length to the radius. Radian = m/m = 1.

## Ontology

SUMO / UNITS-OF-MEASURE

## Class(es)

 guo2 ji4 dan1 wei4

hu2 du4

## Superclass(es)

 shi2 ti3

chou1 xiang4 de5

shu4 liang4

wu4 li3 liang4

chang2 liang4

jiao3 du4 dan1 wei4

ping2 mian4 jiao3 dan1 wei4

hu2 du4

## Coordinate term(s)

dian4 liu2 qiang2 du4 dan1 wei4-an1 pei2  jiao3 du4  fang4 she4 xing4 huo2 du4 dan1 wei4  fa1 guang1 qiang2 du4 de5 dan1 wei4  she4 shi4  ku4 lun2  dian4 rong2 liang4 dan1 wei4-fa3 la1  ke4  ru4 she4 ji4 liang4  dian4 gan3 dan1 wei4  pin2 lv4 dan1 wei4-he4 ci2  gong1 huo4 neng2 de5 dan1 wei4-jiao1 er3  jue2 dui4 wen1 biao1  guang1 shu4 de5 neng2 liang4 dan1 wei4  zhao4 ming2 du4 de5 guo2 ji4 dan1 wei4  gong1 chi3  ke4 fen1 zi3 liang4  li4 de5 dan1 wei4-niu2 dun4  dian4 zu3 dan1 wei4-ou1 mu3  ya1 li4 de5 dan1 wei4  miao3 ji4  dian4 dao3 dan1 wei4  ji4 liang4 dang1 liang4  qiu2 mian4 du4  ci2 tong1 liang4 mi4 du4 zhi1 guo2 ji4 dan1 wei4  dian4 ya1 dan1 wei4  wa3 te4  ci2 tong1 liang4

## Related WordNet synsets

the unit of plane angle adopted under the System 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)

## Axioms (1)

If number shi4 shi2 shu4 de5 shi2 li4, then "number jiao3 du4(s)" deng3 yu1 ""number*"yuan2 zhou1 lv4/"" hu2 du4(s)".
```(=>
(instance ?NUMBER RealNumber)
(equal
(MeasureFn ?NUMBER AngularDegree)
(MeasureFn
(MultiplicationFn
?NUMBER
(DivisionFn Pi 180))