trigonometrical
/ˌtrɪɡənəˈmɛtrɪkəl/
adjective
- Relating to the branch of mathematics that deals with the relationships between the sides and angles of triangles.
- The trigonometrical tables helped sailors navigate by the stars.
- The surveyor used trigonometrical methods to measure the land.
- We studied trigonometrical identities in class today.