1. The problem statement, all variables and given/known data https://dl.dropbox.com/u/64325990/cylindrical.PNG [Broken] 3. The attempt at a solution Okay so I found r = 2.24 and z = -3. However I am stuck at finding theta. I think I just don't understand what the question means when it says "In addition, the line defined by theta = 0 in the cylindrical frame points along the y-axis of the Cartesian frame.". I think it means that the new theta = 0 is the y-axis. If that is the case then theta would be greater than 180°/3.14rads. This is obviously wrong; could anyone please explain what is meant by this question?