Thank you Backpacker, But I don't have a VOR either. I navigate by map & compass, with handheld Memory Map GPS as primary awareness.
I can see no time that I would ever need to work out such a piece of trigonometry whilst airborne.
The fact that there are so many variables other than the triangle, terain, atmopherics, signal strength, etc, would negate any meaningfull solution.
I seem to remember that a geostatic orbit distance around a planet worked out at approximately the circumference of the planet. Now, what use that is or why I discovered it I fail to remember.