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Definition of equilateral triangle noun from the Oxford Advanced Learner's Dictionary

equilateral triangle

noun
equilateral triangle pronunciation English ˌiːkwɪˌlætərəl ˈtraɪæŋɡl equilateral triangle pronunciation American ˌiːkwɪˌlætərəl ˈtraɪæŋɡl
(geometry)
 
a triangle whose three sides are all the same length