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# Question about vectors

Maths and statistics discussion, revision, exam and homework help.

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1. Question about vectors
Can you help me out:

Find, to the nearest degree, the angle that the vector 9i-5j+3k makes with the positive x-axis.
2. Re: Question about vectors
Hmm, I don't know if this is the preferred method, but I would simply sketch out the vector in 3D and use trig to work out the angle.
3. Re: Question about vectors
Let's say you have two vectors and where the angle between them is . Then .

Let . What might you set to be equal to in the above in order to find the angle between and the positive -axis?
4. Re: Question about vectors
(Original post by nuodai)
Let's say you have two vectors and where the angle between them is . Then .

Let . What might you set to be equal to in the above in order to find the angle between and the positive -axis?
Ah yes, that's how it's done. I remember now

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Last updated: April 19, 2012
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