[solved] spherical triangle problem

This is not a homework problem, it's part of a practial engineering problem that I'm trying to solve. I have been struggling with it for a few hours already. I know I should use the Napier rules, but somehow I can't figure it out yet.

I've got a right **spherical** triangle in which angle A and side c are known. What is the formula for side b?

http://upload.wikimedia.org/wikipedi...iangle.svg.png

Re: spherical triangle problem

Ok, after some more digging through the internet I think I managed to find the solution:

$\displaystyle \tan(b)=\tan(c)\cos(A)$

Everyone thanks for reading and thinking about this nevertheless!