Radian

[reidiәn]

解釋/意思:

(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).

阿纳托尔校對--From WordNet

解釋/意思:

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

手打:内蒂

解釋/意思:

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

編輯:罗赞娜