I have this question in my book:- find the angle between the two vectors: A= i - 2j + 3k B= 2i + 3j -2k the solution is based on the scalar product rule.. (so the question is solved)... I`m just tryin to find another way to solve the problem? because I`m not really confident of vectors.. I have a questions also:- Find the vector product of the two vectors: A= i - 2j + 3k B= 2i + 3j -2k now the answer is: -5i+8j+7k.. now how could that resultant vector be perperndicular on A and B? it seems to have a "not right" angle (not 90 degree angle).. because if the origion is 0,0,0.. then -5i +8j+7k makes a "non right" angle (it would only be right if the answer was 0,0,xk where x is any number) if I`m mistaken about the origion being 0,0,0 then what is it? by the way, I`ve asked this question on "Y! asnwers", but none answered, so I`m posting here..