Hi, please bear with me as I have not taken trig in over 10 year.. I am PRETTY sure this is a trigonometry problem.

Here is an image that describes my problem:

Note: the lengths and angles indicated may not be 100% exact, but they should be close. I measured them as well as I was able. The lengths on the labelled sides ARE the same on all the shown triangles, and do not change. The values for X and Y ARE known, and X does not change either.

I need an expression that describes the value for Z in terms of X and Y.

Any help on this would be appreciated, I don't really even know where to start!