# spherical triangle problem

• January 10th 2012, 07:57 AM
corsica
[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?

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