Dr. Taylor
So i did my dot product and got -26 my magnitude that was calculated were 24 and 20 respectively in the order received from the problem. for theta = arccos (-26/sqrt(24*20)) gives me an error why is that ?
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Ok, I believe we talked about this in class today but here goes. Your computation is correct--sort of--but also sort of incorrect. Here's a picture of two lines intersecting:
This intersection makes some angles, I've drawn two of them, one in green, the other in blue. Which of the angles pictured is the angle between the two lines? Your calculation gives the other one.
