(a) a plate of wood, metal, etc. in the form of a right-angled triangle, the acute angles being either 60° and 30° or both 45°, used by draughtsmen…
| 单词 | θ191076 |
| 释义 | society > communication > representation > a plastic or graphic representation > graphic representation > drawing plans or diagrams > [noun] > drawing instruments > triangular (2) set square1854 (a) a plate of wood, metal, etc. in the form of a right-angled triangle, the acute angles being either 60° and 30° or both 45°, used by draughtsmen… triangle1875 A drawing-instrument in the form of a right-angled triangle of wood, vulcanite, etc.; a set square. |
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