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triangle

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triangle/ˈtraɪˌæŋgəl/noun
pluraltriangles
triangle
/ˈtraɪˌæŋgəl/
noun
pluraltriangles
Learner's definition of TRIANGLE  
[count]
: a shape that is made up of three lines and three angles
: something that is shaped like a triangle
: a musical instrument that is made of a steel rod bent into the shape of a triangle and that you play by hitting with a metal rod
: a situation in which one member of a couple is involved in a romantic or sexual relationship with another person
US : a usually plastic or metal device that is shaped like a triangle and used for drawing straight lines and angles
— called also "British"set square
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