| 单词 | director-circle |
| 释义 | > as lemmasdirector-circle director-circle n. (of a conic) the locus of intersection of tangents at right angles to each other; so also director-sphere (of a surface of the second degree).Director-circle is also sometimes used to denote the circle described about a focus of an ellipse or hyperbola with radius = major axis. See Taylor Anc. & Mod. Geom. of Conics (1881) 90. (H. T. Gerrans.) ΚΠ 1867 R. Townsend in Q. Jrnl. Math. VIII. 11 For the paraboloid..the director sphere opens out into a plane. 1882 Daily News 8 June 5/8 Equation to the Director Circle of a Conic, [by] Professor Wolstenholme. < as lemmas |
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