# 3D Vectors

1. Sep 20, 2007

### ThomasHW

1. The problem statement, all variables and given/known data
http://www.tunerspec.ca/school/3dvector.jpg

2. Relevant equations
$$c^{2} = a^{2} + b^{2} - 2ab \times cos \alpha$$
$$\frac{sin a}{a}$$ = $$\frac{sin b}{b}$$

3. The attempt at a solution
I really don't know where to get started... I don't want someone to just do it for me - just a little help would be nice. :)

2. Sep 20, 2007