The Student Room Group

C4 Vectors

e5bb6a7f6af96b76d3cc87535fb391ad.png
For part (d)
If I had drawn the rectangle as:
d5adddbe520fdb1ddce2a229393409b6.png


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 :biggrin:
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 :biggrin:


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.
Reply 2
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! :smile:

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