Find angle between vectors..given 4 points..no idea what to do
Hey just really need some help with this one I have no idea where to start i want to draw it out but I don't now how to draw xyz graphs (Worried)
The question is as follows:
A(-1,2,-2), B(2,14,2), C(2,-3,4) and D(6,-3,7) are four points in space. Find the angle between AB and CD.
i can get to the distance but where do i plug them in the cosine arccos rule?
Thanks so much for the reply... I plugged the numbers on the 3-d distance rule and got AB distance = 13 and CD distance = 5... I'm just not familiar with this cosine arccos rule.
Where do i plug the numbers?
And since there is 3 distances ( I'm guessing... a,b,c) do I then need to work out distance BC or am I missing the point?
Thanks again (Rofl)