单词	arclength
释义	arclength noun arc·​length (ˌ)ärk-ˈleŋ(k)th  -ˈlen(t)th plural arclengths geometry : the length of a segment of an arc Thus, in a unit circle (radius = 1), any angle of 1 radian cuts off an arc of unit length. All other arclengths are proportional to this; for instance, doubling the radius (to 2) and tripling the angle (to 3 radians) yields an arclength of 6. Rheta N. Rubenstein et al., Math Horizons, November 2003 Word History Etymology arc entry 1 + length First Known Use 1849, in the meaning defined above
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