To be fair, I'm still not sure I understand geometry.

I "learned" it in school and promptly never needed to even know if it's existence ever again.

At best, my understanding of geometry is rusty. At worst, it might as well not exist.

Something I learned about schools, as a perfectionist and someone who studies independently when something is interesting, is that, educational institutions are not always correct in what they're teaching. My experience also demonstrates that they don't want to be correct. They want you to provide the answers they've given you, not the correct answers. If you tell them that the answers they're giving you are wrong, even with evidence that's scholastically acceptable, they refuse to do anything.

School isn't there to teach you anything, it's to test if you can follow along and memorize what they think is important, then regurgitate that information back. IMO, this is why having post-secondary education is important in most fields. It demonstrates a willingness to do as you're told sufficiently enough to complete something. The subject matter that you "learned" is mostly irrelevant.

Additionally, highschool curriculums are utter bullshit. The vast majority of what you learn you will never use. Instead of teaching real life skills, like how to vote (and/or register to vote), do your taxes, and seek help from financial aid organizations or similar... How to get information and submit information to/from institutions like city Hall.... The list is long... They instead teach bullshit like the Pythagoras theorem, chemical nomenclature, biology.... The list is still very long. A lot of shit you'll never use unless you're an engineer, architect, mechanic or other related discipline, almost all of which need higher education to get into.

But everyone needs to learn that bullshit for no good goddamned reason, while stuff we all should know, is completely overlooked.

Institutional education is broken and bullshit.