Getting Cinderella
Cinderella is a dynamic geometry software package for exploring geometry. Cinderella can be freely downloaded from the web. To access the program you can go to the Cinderella download site using any standard browser and follow the instructions. The version of Sketchpad you should use is Cinderella 2.0 or higher.

Once you have installed the program, you can locate and run the application. Once the program has started up you should see a screen like the one shown here. Information on using Cinderella to create geometric constructions is on this page .