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Posted by **stephanie** on Thursday, June 21, 2012 at 3:12pm.

[x,y,z] = [3,4,1] + s[-1,5,-2]

[x,y,z] = [8,5,-9] + t[2,3,-6]

- Calculus exam review, PLEASE HELP!! -
**Steve**, Thursday, June 21, 2012 at 3:31pmrecall that you can find the angle θ between vectors u and v using

u•v = |u|*|v|*cosθ

so, just plug and chug:

-2+15+12 = √30√49*cosθ

cosθ = 25/(7√30) = .652

θ = 0.86 = 49.3°

- Calculus exam review, PLEASE HELP!! -
**stephanie**, Thursday, June 21, 2012 at 3:41pmthank you !!

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