Have you downloaded GeoGebra yet? You can download the desktop version from GeoGebra.org, and you can also find versions for your phone or tablet. There’s also a version that runs in a web browser.
One of the nice features of GeoGebra is that you can create an account with GeoGebra, and then that will allow you to access saved files on any of your devices.
For example, I can create files on my laptop, save them, and then open those files on my iPad.
Once you’ve got GeoGebra installed, check out this file which creates a fractal. Fractal patterns are generated by analysing sequences of complex numbers. Year 12 students will hear more about this soon!