CK-12 Foundation
Ck 12: Interactive Geometry: 6.1 Dilations
A transformation is a function that takes points in the plane as inputs and gives other points as outputs. You can think of a transformation as a rule that tells you how to create new points from old points.
San Diego State University
Debian Tutorial
In general this tutorial tries to explain the reasons for things, and help you understand what's going on inside the system. The idea is to empower you to solve new problems and get the most out of your computer. Thus there's plenty of...