Radian

[reidiәn]

Definition

(noun.) 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).

Typed by Anatole--From WordNet

Definition

(n.) An arc of a circle which is equal to the radius, or the angle measured by such an arc.

Editor: Nettie

Definition

n. the angle subtended at the centre of a circle by an arc equal to the radius.

Typist: Rosanna