| 单词 | nine-point circle |
| 释义 | > as lemmasnine-point circle nine-point circle n. (also nine-points circle) Mathematics a circle passing through the mid-points of the three sides of a triangle, the feet of its three altitudes, and the mid-points of the segments of the altitudes from the vertices to their point of intersection. ΘΚΠ the world > relative properties > number > geometry > shape or figure > [noun] > two-dimensional > closed curve > circle > passing through other figure nine-point circle1865 circumcircle1885 1865 W. T. Brande & G. W. Cox Dict. Sci., Lit. & Art (new ed.) I. 461/2 The circle which passes through the middle points of the sides of a triangle..is referred to by Continental writers as the nine-points circle. 1866 W. H. Besant (title) Note on the Nine-point Circle. 1926 Amer. Math. Monthly 33 213 If the incircle coincides with the nine-point circle, the triangle becomes equilateral and the system degenerates. 2000 Times Educ. Suppl. (Nexis) 24 Mar. 15 Who can fail to be amazed by the Euler line or the nine-point circle? < as lemmas |
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