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    Find the angle which the following vector makes with the positive x-direction.
    2i+j+2k

    Do I use the dot product?
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    (Original post by Liampayneisapain)
    Find the angle which the following vector makes with the positive x-direction.
    2i+j+2k

    Do I use the dot product?
    Yes. You'll need a vector in the positive x direction first.
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    Is this A-level or GCSE?? Because I think your posting this question in the GCSE maths section instead of the A-level one!
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    (Original post by NothingButWaleed)
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    This is the correct forum for this question.
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    (Original post by Mr M)
    This is the correct forum for this question.
    But how? This is the GCSE section!
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    (Original post by NothingButWaleed)
    But how? This is the GCSE section!
    This is F38 - the Maths Forum. All ages and levels of education welcome.
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    (Original post by Mr M)
    This is F38 - the Maths Forum. All ages and levels of education welcome.
    Oh ok!
 
 
 
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