# Trigonometry

Learn Trigonometry easily from basics to very advanced level for beginners to advanced learners.

## Introduction

A mathematical science that reveals relation between angles and lengths of sides of a triangle is called Trigonometry.

The word Trigonometry was derived from two Greek words "Trigonon" and "Metron". According to Greek Language, The meaning of Trigonon and Metron are a triangle and measure respectively. Measuring a triangle, which means measuring lengths of its sides, angles and investigating the relation between them is purpose of trigonometry in mathematics.

### Basics

Learn basic concepts, angle and right angled triangle to start learning trigonometry.

#### Functions

Six trigonometric functions are introduced in trigonometry by the ratio of any two of three sides of the right angled triangle. The six ratios are called by six different names.

### Identities

List of formulas in trigonometry.

#### Basic Formulas

Learn basic trigonometry identities to understand basic relations between trigonometry functions in various possible forms.

#### Advanced Formulae

List of advanced identities in trigonometry with proofs for advanced learners.