trigonometric

/ˌtrɪɡənəˈmɛtrɪk/
adjective
  1. Relating to the branch of mathematics that deals with the relationships between the sides and angles of triangles.
    • We used trigonometric formulas to calculate the height of the building.
    • The trigonometric functions sine and cosine are essential in physics.
    • Her homework included solving several trigonometric equations.