ive got two vectors and i need to find the angle between them. AB = -1.95i + 2.4j +.3k AC = 2.4j+1.8k i looked up the answer and found it to be 46.8 deg. i used the equation (AB)(AC) cos theta = ACxABx +ACyABy + ACzABz the dot product is 6.84. but the equation ends up like this cos theta = (ACxABx +ACyABy + ACzABz)/(AB)(AC) this is a dot product on top and on bottom right? i dont quite understand how this works. according to the answer, ABAC should be around 10.