Meaning of TRIANGLE in English
/ ˈtraɪæŋgl; NAmE / noun
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.
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
a situation involving three people in a complicated relationship :
a love triangle
—see also eternal triangle
( NAmE ) = set square
late Middle English : from Old French triangle or Latin triangulum , neuter of triangulus three-cornered (see tri- and the noun angle ).
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005