I got the formula, what does the angle effect? Net Magnetic force

[mr_coffee]

Hello everyone, I think I am missing this problem because there is an angle invovled, but it doesn't seem to matter what angle it is from what my lecture notes say. but here's the question:
The bent wire shown in Fig. 28-39 lies in a uniform magnetic field. Each straight section is 2.1 long and makes an angle of = 62° with the x axis, and the wire carries a current of 2.0 A. What is the net magnetic force on the wire in unit-vector notation if the magnetic field is given by each of the following?
Here is the picture:
http://www.webassign.net/hrw/28-39.gif

Here is my work:
http://show.imagehosting.us/show/891660/0/nouser_891/T0_-1_891660.jpg
any ehelp would be great!

THe formula states: Fbtotal= F1 + F2 + F3 + ... + Fn then it says: F = I(L1 + L2 +...+Ln) x B

 

[whozum]

Right, the angle comes in with the cross product at the end..

 

[mr_coffee]

can you expland that explanation alittle more? How do you apply the cross product with the angle? I know the dot product has like AB = cos/|A||B| but i never heard of one for the cross product of A B.

 

[jtbell]

The magnitude of $\vec A \times \vec B$ is $AB \sin {\theta}$.

 

[s7b]

Wouldn't both the forces be equal and just opposite in direction therefor the net force is zero??