# Interactive Unit Circle

Sine, Cosine and Tangent ... in a Circle or on a Graph.

images/circle-unit.js

## Sine, Cosine and Tangent

**Sine**, **Cosine** and **Tangent** (often shortened to **sin**, **cos** and **tan**) are each a **ratio of sides** of a right angled triangle:

For a given angle ** θ** each ratio stays the same

no matter how big or small the triangle is