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English definition of “triangle”

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triangle

noun [C]  /ˈtrɑɪˌæŋ·ɡəl/ us  
mathematics a flat shape with three straight sides: Her earrings were in the shape of triangles. music A triangle is also a musical instrument consisting of a thin metal bar having three sides, which makes a high sound when held up in the air and hit with a metal bar.
(Definition of triangle from the Cambridge Academic Content Dictionary © Cambridge University Press)
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