Meaning of TRIANGLE in English

TRIANGLE

/ ˈtraɪæŋgl; NAmE / 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 ) = set square

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WORD ORIGIN

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.