| 单词 | radian |
| 释义 | Word Frequency radian(ˈreɪdɪən) noun an SI unit of plane angle; the angle between two radii of a circle that cut off on the circumference an arc equal in length to the radius. 1 radian is equivalent to 57.296 degrees and π/2 radians equals a right angle Symbol: radWord origin C19: from radius |
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