re: what math do you use regularly?

At my last job i was a loftsman at a fabrication yard. We figured out cut patterns for the ends of structural pipe to build offshore jackets, pipe decks, boat bumpers, vent booms..... We had to do know how to do slide angles, batter, true batter. Enter all that into a program and it would spit out a pattern. So we used a lot of geometry.

Now I'm a draftsman, we have some more advanced programs so we hardly use any math other than basic math and some very basic geometry.