If you look at Excel help for the TAN function, you will see that the "See
also" link points to ATAN and ATAN2. Decide which of those you want.
--
David Biddulph

"Mustavagander" wrote in message
...
I know the lengths, and I know its a TAN function but I cant see how to
actually write the formulae to solve it

I'm using Excel 2003, and I've converted the opposite/adjacent into a tan
by
using =tan(x/y) where x is the opposite and y is the adjacent, but how do
I
get the number it produces into an angle without physically looking each
one
up on a table?