| 单词 | focal curve |
| 释义 | > as lemmasfocal curve focal curve n. Geometry rare a curve formed by the centres of curvature of another curve; = evolute n. 1a. ΚΠ 1828 Trans. Royal Irish Acad. 15 Science 77 Plane curves having a given caustic; focal curves. 1929 Philos. Trans. (Royal Soc.) A. 228 338 The locus of the foci we call the ‘focal curve’. 2002 N. M. Patrikalakis & T. Maekawa Shape Interrogation viii. 203 For a parametric space curve r ( t ), a focal curve or an evolute..is defined as f ( t ) = r( t ) + n( t )/κ. < as lemmas |
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