trigonometry
/ˌtrɪgəˈnɒmɪtrɪ/noun
mass noun
- the branch of mathematics dealing with the relations of the sides and angles of triangles and with the relevant functions of any angles三角学。
派生词
trigonometric
/ˌtrɪgənəˈmetrɪk/ adjectivetrigonometrical
adjective词源
early 17th cent.: from modern Latin trigonometria （see TRIGON, -METRY）.