The descriptions of the four lessons are in two files, one in English and one in French. To access the English file, click here. To access the French file, click here. It will probably be best to download these files to your own computer to read them.
To see the dynamic versions of the constructions, you will need to have Geometer's Sketchpad installed on your computer. Then you can download the GSP files for the four constructions, either in English or in French: