RADIAN
\ɹˈe͡ɪdi͡ən], \ɹˈeɪdiən], \ɹ_ˈeɪ_d_iə_n]\
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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)
By DataStellar Co., Ltd
By Oddity Software
By Noah Webster.
By Thomas Davidson