radian
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 词源late 19th cent.: from radius + -an.
词汇 | radian |
释义 | radiannoun /ˈreɪdiən/ /ˈreɪdiən/ (geometry
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