[Superbuu91]

I know i spelt it wrong, can anyone help me out by telling me what formulas a landscape arcetect uses. Math formulas, also tell me what site you got it from.
Example=
A is the air pressure, Fg is the foreign Gasses, D is diamiter (these are examples lol)
A*2+45/Fg*D

That isnt real but thats something wat the site should say. I need a site for a forumula and i need it fast. I looked a long time today, yesterday, and wensday but no luck. I only found info on other things on it but no forumula.