From Wikipedia, the free encyclopedia
Radians (n. -tis),[1] vulgo radian, breviter rad, est unitas mensurae angulorum planorum. In omnibus circulis, angulus unius radiantis arcum secat cuius longitudo par radii circuli est. Quoniam longitudo circuli radii est , angulus plenus (360°) est, atque rad; angulus rectus (quadrans anguli pleni, 90°) rad. Unum radians ergo est ca. 57,3°.
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