| 单词 | vertical angle |
| 释义 | > as lemmasvertical angle 2. vertical angle: extracted from verticaladj.n. a. An opposite angle (see opposite adj. 1a). ΘΚΠ the world > relative properties > number > geometry > angle > [noun] > other angles vertical angle?a1560 trient1563 vertical1728 recipient1811 perigon1868 steregon1881 ?a1560 L. Digges Geom. Pract.: Pantometria (1571) i. vi. sig. C iij Two right lines crossing one an other, make the contrary or verticall angles equall. 1660 tr. I. Barrow Euclide's Elements i. 17 The verticall (or opposite) angles. 1704 J. Harris Lexicon Technicum I. at Angles Opposite or vertical Angles, as, 1. Those that are made by two Right Lines crossing each other, and which touch only in their Angular Point. 1771 Encycl. Brit. III. 910/2 The tangent of half the vertical angle. 1771 Encycl. Brit. III. 910/2 The line CF bisecting the vertical angle. 1862 I. Todhunter Elem. Euclid i. 15 If two straight lines cut one another, the vertical or opposite angles shall be equal. b. The angle opposite the base of a triangle or polygon. ΘΚΠ the world > relative properties > number > geometry > angle > [noun] > other angles > opposite base of shape vertical angle1798 1798 C. Hutton Course Math. I. 366 In a Triangle, having given the two Sides, about the Vertical Angle. < as lemmas |
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