GAtM Online Resources
Resources pertaining to GAtM are published on this website. They include the PDF versions of the textbook and answer key, individual chapters, and also simple web apps for students.
GAtM's source code can be found here. You are welcome to make an issue, or even a fork and pull request, if you identify an issue with the text; if you do clone it and run it on your computer, make sure to read the README to learn how to build it. GAtM is written with LaTeX, Asymptote, and Tikz.
Interactives are not finished. For now, here are a few links: It's A Snap and Rotation and Reflection Groups.
The full PDF for the textbook; chapters are provided for convenience. Keep in mind that these versions are continuously updated, and so may not match the print version.
Click here for the full textbook
This key contains answers to all of the problems in the textbook. Note that only the first five chapter PDFs have been completely updated to match the textbook; the full answer key and other chapters may contain answers to problems that do not exist.
Click here for the full answer key