right-angled triangle - definition and synonyms

noun [countable] maths British 

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/ˌraɪt æŋɡ(ə)ld ˈtraɪæŋɡ(ə)l/
singularright-angled triangle
pluralright-angled triangles
  1. a flat shape with three straight sides and three angles, one of which is a right angle