Could someone please explain to me how the "right-handed" rule works and how you would use it to appropriate vector questions with it? I understand that you have your right thumb pointing upright and move your thumb the way that the vector moves (or something like that). Although, what I particularly do not understand is how you would be able to answer it with questions. Such as, "True or false: a x (b x a) is perpendicular to a but not to b. (The given diagram that the 'end' of both b and a meet at a high point, whereas the beginning of both b and a come outwards ( /\ <-- basically, with b on the left, a on the right.) I have tried to make sense out of the explanation and examples my textbook has provided although, I am still confused.