I WAS going to say this applies more to art than to math even though it it mathematical.....The Golden Rectangle is a fairly common proportion in art work. Piet Mondrian is probably the most obvious use of it and modular grid systems.

@simbha: that`s because you`re APPLIED math :p For us PURE mathematicians, this is instantly recognizable. My first thought was that it`s a little dull for a tattoo if the golden rectangle. Also, punk7643, that just goes to show how much art relies on math :)

I wonder if you change weight the proportions would be wrong? Like a triangle drawn on the surface of a sphere would have angles that add up to more than 180 degrees.

- Cue the uptight prigs that are going to say this isn`t math, but rather something else.
So close, I`ll give you partial credit.

The Golden Ratio is a/b = b/(a+b)

or in your words, A is to B as B is to A+B

Also, punk7643, that just goes to show how much art relies on math :)