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in the PONS Dictionary

triangle [ˈtraɪæŋgl̩] N

triangle
OpenDict entry

triangle N

spherical triangle geometria
scalene triangle geometria
Pascal's triangle MATH
obtuse triangle geometria

isosceles triangle [aɪˌsɒsəli:zˈ-, Am -ˌsɑ:s-] N MATH

isosceles triangle