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

isosceles triangle

noun
isosceles triangle pronunciation English aɪˌsɒsəliːz ˈtraɪæŋɡl isosceles triangle pronunciation American aɪˌsɑːsəliːz ˈtraɪæŋɡl
(geometry)
 
a triangle with two of its three sides the same length