I'm aware that you need to use Asquare+Bsquare=
Csquare (or at least I honk is), but I don't know how to tell which one's is C and which one is A or B.

Im aware that you need to use AsquareBsquare Csquare or at least I honk is but I dont know how to tell which ones is C and which one is A or B class=