Triangle
来自Big Physics
Safin（讨论 | 贡献）2022年4月27日 (三) 06:23的版本 （建立内容为“Category:etymology == google == [https://www.google.com.hk/search?q=triangle+etymology&newwindow=1&hl=en ref] late Middle English: from Old French triangle o…”的新页面）
late Middle English: from Old French triangle or Latin triangulum, neuter of triangulus ‘three-cornered’ (see tri-, angle1).
wiktionary
From Middle English triangle, from Old French triangle, from Latin triangulum, noun use of adjective triangulus(“three-cornered, having three angles”), from trēs(“three”) + angulus(“corner, angle”).
etymonline
triangle (n.)
late 14c., from Old French triangle (13c.), from Latin triangulum "triangle," noun use of neuter of adjective triangulus "three-cornered, having three angles," from tri- "three" (see tri-) + angulus "corner, angle" (see angle (n.)).
