Question

I have this model:

http://www.ise.ncsu.edu/kay/msf/fig5.jpg

(Sorry, I can't post the image tag yet)

What values do I have:

1) Dm

2) Dl - Dr

What I can't figure out, is how to calculate the "men's position" represented on this image.

I don't have "Dl" and "Dr" individually, just the difference of them.

If you could help with some reference on how I can calculate the men's position, or how can I get the theta represented on image, I would be grateful.

Thanks in advance.