9.4 13,15,17
My answers are way off on these problems, I think I'm missing something.
posted by Sam P. at 8:58 PM
Sunday, April 15, 2007
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2 Comments:
it helps a lot if you draw a picture. you can find the angle that each vector makes with the x-axis by taking the inverse tangent of the ratio between the y-coordinate and x-coordinate. Then i think you add together the absolute value of the two angles to get the angle between the two vectors (since in these problems the x-axis is generally between the two vectors).
well, i used the formula in the book, the Angle Theorem, which states cosX= (u*v)/(llull*llvll) and took the inverse cos after finding the value. Hope that helps
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