I used to know all of these formulae by heart but it's been a long time HS. I found this on the net and ended up using it a lot to build my rear 3-link. (Running inside from the garage with ym measurements written down over and over again.) It proved to be invaluable. If you go to the home page, there are, like, a hundred different calculators for different types of math, including a pathagorean calculator in the geometry section. But this triangle trig calculator is the one I used the most. http://www.1728.com/trig4.htm

J. J.