Finding magnitudes of vectors given angles

[randomhobo]

Homework Statement

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 .

Homework Equations

A_x cos θ
A_y sin θ

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?

 

[CompuChip]

Homework Equations

A_x cos θ
A_y sin θ

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.

 

[brushman]

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

 

[DrewBlay]

Thanks for this, very helpful



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