radian
radian
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) [enota ravninskega kota SI; enak kot v središču kroga, ki ga omejuje lok enake dolžine kot polmer kroga (približno 57,295 stopinj)]