trigonometry
noun/ˌtrɪɡəˈnɒmətri/
/ˌtrɪɡəˈnɑːmətri/
[uncountable]- the type of mathematics that deals with the relationship between the sides and angles of trianglesTopics Maths and measurementc2Word Originearly 17th cent.: from modern Latin trigonometria (from trigon (via Latin from Greek trigōnon, neuter of trigōnos ‘three-cornered’) + -metry).
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trigonometry