| 单词 | radian |
| 释义 | radianradian /ˈreɪdiən/ (also ˌradian ˈmeasure) noun [countable] math, geometry a unit for measuring angles. A radian is equal to the angle at the center of a circle with an arc (=curved part) that is the same length as the radius (=distance from the center to the edge of a circle). |
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