Alright, thanks! I will try what you said :)
I didn't quite get what geno said, and I tried something different. I basically used law of cosines to find all 3 side lengths of ABC in terms of AE, then solved for it with pythagoras. It worked!
I tried what you said up until the last step, I'm probably missing ONE tiny bit but I can't seem to figure out how to do it...
Thanks! I will try and do that! :) :)
