Question

what is trigonometry

Answer 1

Trigonometry is a branch of mathematics that studies relationships involving lengths and angles of triangles. The field emerged in the Hellenistic world during the 3rd century BC from applications of geometry to astronomical studies. 

Answer 2

trigonometry is made up of three words tri+gono+metry
tri means triangle ,gono means angles and metry means to measure so trigonometry means measurement of all the three angles of triangle