| 单词 | orthoptic locus |
| 释义 | > as lemmasorthoptic locus orthoptic locus n. Geometry (now rare) the locus of the intersection of two tangents to a curve that are at right angles to each other; cf. orthocycle n. at ortho- comb. form 1. ΘΚΠ the world > relative properties > number > geometry > curve > [noun] > locus locus1675 evolute1704 place1704 trajectory1795 syntractory1820 focal surface1828 synharmonic1850 syntractrix1852 pedal1862 umbilical focal conic1862 umbilical focal conic1862 stigmatic1863 synchronism1867 synchronous curve1867 Steinerian1873 tac-locus1873 strophoid1880 orthoptic locus1882 strophoidal1908 hypercycle1909 1882 in Athenæum 17 June 769/1 ‘Theory of Orthoptic Loci’, by Rev. Dr. Taylor. 1886 C. Taylor Order of Orthoptic Loci in Messenger of Math. 16 1 The locus..may be called its Orthoptic Locus, since at every point thereof the curve subtends or is seen under a right angle. 1908 Amer. Jrnl. Math. 30 387 The orthoptic locus of the pentatroid is composed of a limaçon and the curve. 1951 Amer. Math. Monthly 58 637 In any triangle the Monge circle (orthoptic locus) of the inscribed conic concentric with the circumcircle is orthogonal to the polar circle. < as lemmas |
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