柯林斯词典trigonometry /ˌtrɪɡəˈnɒmɪtrɪ/ 1. N-UNCOUNT Trigonometry is the branch of mathematics that is concerned with calculating the angles of triangles or the lengths of their sides. 三角學 返回 trigonometry剑桥词典a type of mathematics that deals with the relationship between the angles and sides of triangles , used in measuring the height of buildings , mountains , etc. （數學中的）三角學 Trigonometry concerns the functions of angles , such as sine , cosine , and tangent . 三角學研究的是角的函數，例如正弦、餘弦和正切。 返回 trigonometry