Both are measured in both here, because the US is actually also on the metric system. We've been "metric" since 1866 and signed the treaty in 1875.
We've just done the extra work redefining our customary units in terms of metric ones and then kept on using them. There was a governing body created in 1975 to push the issue. It was later dissolved in the 80s because no one gave a fuck.
Pretty much just the side dishes: Alabama dunks it in sweet‑tea BBQ sauce while hollering "Roll Tide," West Virginia soaks it in moonshine, hands you a pepperoni roll, and cranks "Country Roads" on repeat. Same brochure; just different tailgate menus.
Surprisingly little trig, from my experience with opengl, direct3d, and vulkan. Much of the interfaces abstract that away. It helps you to understand what's going on if you do know it, but you can go in without and be able to do fine. Most of what you interact with is angle calculations.
Yeah, I never needed an AI to write poor, inefficient, and ineffective code. I've always had a tremendous personal capacity for that. Why should I give a company money to do something that I'm already good at?