triangle
/ˈtrɑɪˌæŋ·gəl/ n [C]Definition
› 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 n from the Cambridge Academic Content Dictionary
© Cambridge University Press)
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