Trigonometry - Wikipedia
Trigonometry (from Ancient Greek τρίγωνον (trígōnon) 'triangle', and μέτρον (métron) 'measure') is a branch of mathematics concerned with relationships between angles and ratios of lengths.

Introduction to Trigonometry - Math is Fun
Trigonometry (from Greek trigonon "triangle" + metron "measure") Want to learn Trigonometry? Here is a quick summary. Follow the links for more, or go to Trigonometry Index Trigonometry ... is all about triangles. Trigonometry helps us find angles and distances, and is used a lot in science, engineering, video games, and more! Right-Angled Triangle

Trigonometry | Khan Academy
Start Course challenge. Learn trigonometry—right triangles, the unit circle, graphs, identities, and more.

Trigonometry | Definition, Formulas, Ratios, & Identities
Trigonometry, the branch of mathematics concerned with specific functions of angles. There are six functions commonly used in trigonometry: sine (sin), cosine (cos), tangent (tan), cotangent (cot), secant (sec), and cosecant (csc). Learn more about trigonometry in this article.

Sine, Cosine, Tangent - Math is Fun
Sine, Cosine and Tangent are the main functions used in Trigonometry and are based on a Right-Angled Triangle. Before getting stuck into the functions, it helps to give a name to each side of a right triangle: "Opposite" is opposite to the angle θ "Adjacent" is adjacent (next to) to the angle θ "Hypotenuse" is the long one

Trigonometric equations and identities | Trigonometry | Math ...
Math Trigonometry Unit 4: Trigonometric equations and identities 700 possible mastery points Mastered Proficient Familiar Attempted Not started Quiz Unit test About this unit

Trigonometric functions | Algebra (all content) - Khan Academy
Trigonometric functions | Algebra (all content) | Math | Khan Academy Algebra (all content) 20 units · 412 skills Unit 1 Introduction to algebra Unit 2 Solving basic equations & inequalities (one variable, linear) Unit 3 Linear equations, functions, & graphs Unit 4 Sequences Unit 5 System of equations Unit 6 Two-variable inequalities