I made a small calculator for calculating various dimensions of a mega tree, given information like length of string, or diameter of base, or height of pole.
I was tired of having to use the Pythagorean theorem to figure out some of my dimensions. Pretty easy tool to use to get a quick idea of how big you need to make your tree.
Here it is: http://www.altoonalights.com/mega/mega_calc.php
I'll be making it prettier. Suggestions are welcome.