The point A and B have coordinates (2,3,-1) and (5,-2,2) respectively. Calculate the acute angle between AB and the line with equation

r=(2,3,-1)+t(1,-2,2), giving your answer correct to the nearest degree.

All i need to know is which two to multiply

e.g: (x,y,z) x (x1,y1,z1)

(MY PROBLEM IS HOW TO FIND OR WHICH TWO POINTS TO MULTIPLY)

the i know how to continue

Thanks in advance.