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2026-01-11

“radian”的英文意思

单词 radian
释义 radian Trig.|ˈreɪdɪən|
[f. radi-us + -an.]
(See quot. 1879.)
1879Thomson & Tait Nat. Phil. I. i. §41 The usual unit angle is..that which subtends at the centre of a circle an arc whose length is equal to the radius;..for brevity we shall call this angle a radian.1881Halsted Mensuration 24 The number which expresses any angle in radians also expresses its intercepted arc in terms of the radius.
“radian”的英文意思

　

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