Homework Help: 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

Thanks for this, very helpful

_______________________________________

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