# Finding magnitudes of vectors given angles

1. Sep 5, 2010

### randomhobo

1. The problem statement, all variables and given/known data

Vector A points in the negative direction. Vector B points at an angle of 35.0 above the positive axis. Vector C has a magnitude of 16 and points in a direction 44.0 below the positive axis.
Given that A+B+C=0 , find the magnitudes of A and B .

2. Relevant equations

Ax cos θ
Ay sin θ

3. The attempt at a solution
I think I have the picture of the triangle graphed out, but since there are no 90 degree angles, how do I use the relevant equations to find the magnitudes?

Last edited: Sep 5, 2010
2. Sep 5, 2010

### CompuChip

That's not an equation, it's just a formula with some variables and a cosine.
Maybe you can look up precisely what formula you wanted to write there and explain to us what it means?
(This is not to be strict about the rules; but if you mean what I think you mean, then understanding what that formula says is the key to the solution)

Also, can you post the complete question? You just defined A, B and C, and you have to calculate the missing magnitudes, if I understand it correctly, but that is not enough info.

3. Sep 5, 2010

### brushman

Try using the law of sines (I believe this works).

4. Sep 21, 2010

### DrewBlay

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For angles games from the list of the subjects: http://www.free-training-tutorial.com/angles-games.html" [Broken]
http://www.free-training-tutorial.com/math-games.html" [Broken]

Last edited by a moderator: May 4, 2017