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    For part (d)
    If I had drawn the rectangle as:
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    It would seem that I would work out the acute angle whereas the answer has the obtuse one, so is the drawing I made wrong, if so how?

    Thank you
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    (Original post by IgorYakov)

    It would seem that I would work out the acute angle whereas the answer has the obtuse one, so is the drawing I made wrong, if so how?

    Thank you
    It's not to scale. If you look at the vectors a,b, you'll see that their lengths are 3, 2rt(3) respectively. So, OB is a longer side than OA.
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    (Original post by ghostwalker)
    It's not to scale. If you look at the vectors a,b, you'll see that their lengths are 3, 2rt(3) respectively. So, OB is a longer side than OA.

    Aah yes thank you!
 
 
 
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