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trijet
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trigonometry

trig·o·nom·e·try [ trìggə nómmətree ]


noun 
Definition:
 
branch of mathematics: a branch of mathematics dealing with properties of triangles and their applications, e.g. in surveying

[Early 17th century. < modern Latin trigonometria< Greek trigonos "three-cornered" < trigōnon (see trigon)]
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