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Coordinate angles of three dimensional vectors

  1. Feb 7, 2014 #1
    1. The problem statement, all variables and given/known data
    If u know the value of two coordinate angles there is an ulimeted amount of possibility for finding the third coordinate angle
    A. True
    B. False

    2. Relevant equations



    3. The attempt at a solution
    I .not too sure about this one any suggestions would be appreciated I think its tfalse hough
     
  2. jcsd
  3. Feb 7, 2014 #2
    What is the sum of the squares of the three direction cosines equal to?
     
  4. Feb 7, 2014 #3
    they sum to 1
     
  5. Feb 7, 2014 #4
    Two coordinate angles? Angles between vectors? I don't understand the question.
     
  6. Feb 7, 2014 #5
    Does that help answer your question?
     
  7. Feb 7, 2014 #6

    haruspex

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    This approach works, but it might also help to think of it geometrically. What shape is formed by the set of lines at a given angle to the positive half of an axis?
     
  8. Feb 7, 2014 #7

    I'm only confuse of the term unlimited I know there is the method of just subtracting the squared Cosine of the other angles from one to get the third though I'm unsure about the term unlimited since even though I know thats a method I Dont know if its the only method
     
  9. Feb 7, 2014 #8

    haruspex

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    The question isn't asking about different methods of finding the answer; it's asking if the number of solution values is unlimited. You can use whatever method you like.
     
  10. Feb 8, 2014 #9

    Its false right?
     
  11. Feb 8, 2014 #10

    haruspex

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    Yes. How many possibilities are there for the third angle?
     
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