- 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: rad
| 单词 | radian |
| 释义 | WordReference Random House Unabridged Dictionary of American English © 2024 ra•di•an (rā′dē ən),USA pronunciation n. [Math.]
Collins Concise English Dictionary © HarperCollins Publishers:: radian /ˈreɪdɪən/ n
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