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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.

## Ontologie

SUMO / UNITS-OF-MEASURE

## Class(es)

 jednotka SI

 entita

abstraktum

veličina

fyzikální veličina

konstantní veličina

jednotka úhlu

jednotka plošného úhlu

## Související termín(y)

ampere  angular degree  becquerel  candela  celsius degree  coulomb  farad  gram  gray  henry  hertz  joule  kelvin degree  lumen  lux  meter  mole  newton  ohm  pascal  second duration  siemens  sievert  steradian  tesla  volt  watt  weber

## 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)

## Axiomy (1)

Jestliže number je instancí třídy reálné číslo, potom "number angular degree(s)" se rovná ""number*"pi/"" radian(s)".
(=>
(instance ?NUMBER RealNumber)
(equal
(MeasureFn ?NUMBER AngularDegree)
(MeasureFn
(MultiplicationFn
?NUMBER
(DivisionFn Pi 180))