triangle

Từ điển Oxford Advanced Learner 8th

tri·angle [triangle triangles] BrE [ˈtraɪæŋɡl] NAmE [ˈtraɪæŋɡl] noun
1. a flat shape with three straight sides and three angles; a thing in the shape of a triangle: (BrE)a right-angled triangle
• (NAmE)a right triangle
• Cut the sandwiches into triangles.
2. a simple musical instrument that consists of a long piece of metal bent into the shape of a triangle, that you hit with another piece of metal
3. a situation involving three people in a complicated relationship
•a love triangle
see also ↑eternal triangle
4. (NAmE) (BrE ˈset square)an instrument for drawing straight lines and angles, made from a flat piece of plastic or metal in the shape of a triangle with one angle of 90°
See also: ↑set square

Word Origin:
late Middle English: from Old French triangle or Latin triangulum, neuter of triangulus ‘three-cornered’ (see ↑tri- and the noun ↑angle).

Example Bank:
•I cut the sandwiches into triangles.
•Use your protractor to construct an equilateral triangle.
•a large region resembling an inverted triangle

• Từ đồng nghĩa / Synonyms:
  Triangulum, Triangle, trigon, trilateral