Touch Trigonometry is a simple Flash gizmo (written entirely in ActionScript 3.0) that hopes to help math learners of all ages get an intuitive understanding of trigonometry. It aims to do that by letting you just play with the trig functions, with no buttons to get in the way.

‘it is important that there exists a relationship between the graph layouts that achieves a mental map between the various relationships represented by each graph while preserving readable drawings for each individual graph layout in the series’