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Anyone able to help with these vectors geometry and planes questions?

  1. Apr 27, 2004 #1
    Can anyone help me with parts (b) and (c) of this question: [​IMG]


    I've done parts (i) and (ii) but can anyone help with parts (iii) and (iv)
    [​IMG]

    answers for parts (i) and (ii):
    [​IMG]


    Thanks heaps, it is really important and kinda urgent.
     
  2. jcsd
  3. Apr 27, 2004 #2

    arildno

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    Dearly Missed

    b) You should use the cosine-formula to express thess these lengths.
    Also, remember the relation between the inner product, vector lengths, and the cosine of the angle between the two vectors.
    c) Ought to follow easily from b)
     
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