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Homework Help: Multiplying Vectors

  1. Sep 11, 2007 #1

    1. Show that the area of the triangle contained between vector a and vector b and the red line is 1/2 |a x b|

    So far i have that bcosO would equal a ...and that 1/2bh should be the area... but im stuck. can somebody help me prove?
    Last edited: Sep 11, 2007
  2. jcsd
  3. Sep 11, 2007 #2

    D H

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    [itex]b\cos\theta=a[/itex] is not correct. Assuming vector b forms the base of the triangle, [itex]A=1/2bh[/itex] is the correct equation for the area. So what is the height of the triangle? (Hint: it involves only a and theta).
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