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    How do I know which angle are they looking for?


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    cool handwriting :gah:
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    The angle they are looking for is directed out of the vectors BA and OC. Using the vectors AB and OC will initially give the wrong angle. Therefore I think (according to your working) they the answer is 109 degrees (180-71).
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    you need BA and CO. The position vectors have to go in the other direction
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    (Original post by Anonymous0155)
    you need BA and CO. The position vectors have to go in the other direction
    Using BA and CO will give the angle ADO, not ADC.
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    (Original post by doivid)
    The angle they are looking for is directed out of the vectors BA and OC. Using the vectors AB and OC will initially give the wrong angle. Therefore I think (according to your working) they the answer is 109 degrees (180-71).
    Using the pair BA and OC does not help

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    (Original post by Moa)
    Using the pair BA and OC does not help
    It's not +- 27, it's just 27. You've found the magnitude of BA and OC, which are by definition positive values.
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    (Original post by doivid)
    It's not +- 27, it's just 27. You've found the magnitude of BA and OC, which are by definition positive values.
    Right! Thats true, thanks mate
 
 
 
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