Trigonometry is the study of angles. It is a branch of mathematics that is used for algebraic solving in geometry. With the knowledge of trigonometry anything from calculus to vector algebra can be solved.

All of the trigonometric functions of an angle θ can be constructed geometrically in terms of a unit circle centered at O.
Unit circle angles.svg
Trigonometric Chord.svg
Trig Functions.png
Sine cosine sum rule.svg
Sine and Cosine fundamental relationship to Circle (and Helix).gif

Trigonometry is used in finding out the heights of tall objects like mountains, trees, etc. The tool used in trigonometry for this purpose is called clinometer.

"There is perhaps nothing which so occupies the middle position of mathematics as trigonometry."-J. F. Herbart


Divisions of trigonometry