I'm blind when it comes to angles

[rocomath]

did i set up my force diagram right? my teacher gave us soln's but i think there's an error.

also, could i get advice on how to approach determining how to place the angles correctly in the diagram, I'm blind.

thanks!

http://img136.imageshack.us/img136/5711/angleqg6.jpg

 

[arildno]

Your angles are right.
Try imagine the N,T-axes to initially have been superimposed on the y,x-axes, respectively.
Then rotate the N-T system so that T gains angle theta to the x-axis.
Therefore, the angle between the N and y axes must also be theta.