trigonometry

== English == === Etymology === From 1610s, from New Latin trigōnometria, from Ancient Greek τρίγωνον (trígōnon, “triangle”) + μέτρον (métron, “measure”), equivalent to trigono- +‎ -metry. === Pronunciation === IPA(key): /ˌtɹɪɡəˈnɒmətɹi/ === Noun === trigonometry (countable and uncountable, plural trigonometries) (geometry, mathematical analysis) The branch of mathematics that deals with the relationships between the sides and angles of (in particular) right-angled triangles, as represented by the trigonometric functions, and with calculations based on said relationships. ==== Synonyms ==== (branch of mathematics): trig (informal, abbreviation) ==== Derived terms ==== plane trigonometry spherical trigonometry ==== Related terms ==== geometry trigon trigonometric trigonometrist ==== Translations ==== === References === === Further reading === Trigonometric functions on Wikipedia.Wikipedia Trigonometric tables on Wikipedia.Wikipedia Pythagorean trigonometric identity on Wikipedia.Wikipedia List of trigonometric identities on Wikipedia.Wikipedia