trig·o·no·met·ric
adjective/ˌtrɪɡənəˈmetrɪk/
/ˌtrɪɡənəˈmetrɪk/
(also trigonometrical
(mathematics)/ˌtrɪɡənəˈmetrɪkl/
/ˌtrɪɡənəˈmetrɪkl/
)- connected with the type of mathematics that deals with the relationship between the sides and angles of triangles
三角学