radian

Noun
  1. The unit of plane angle adopted under the Systeme 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) (synset 113633285)
    is a type of: angular unit - a unit of measurement for angles
    has: milliradian - a unit of angular distance equal to one thousandth of a radian
    same as: rad

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