ra·di·an
noun/ˈreɪdiən/
/ˈreɪdiən/
(geometry)- a unit used to measure an angle, equal to the angle at the centre of a circle whose arc is the same length as the circle’s radius
弧度 Word Originlate 19th cent.: from radius + -an.
| 单词 | radian |
| 释义 | ra·di·announ/ˈreɪdiən/ /ˈreɪdiən/ (geometry)
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