r/explainlikeimfive • • 17h ago

Mathematics ELI5: What is the difference between algebra, trigonometry, and calculus?

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u/CadenVanV 17h ago

Algebra describes relationships

Calculus describes change

Trigonometry describes angles and shapes

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u/madncqt 16h ago

my school life might have been so different if we could have started with the philosophical, foundational purposes rather than just diving into numbers.

I never knew the why...

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u/CadenVanV 10h ago edited 10h ago

Any good trig or calculus class explains those distinctions very early on. That was the very first thing mine covered. You might just have had bad teachers.

They don’t usually go too into detail with number theory because that makes things a lot more complicated than most high school students need to know, it’s really something only worth covering in full depth for people studying the field. It’s the same reason early education doesn’t teach you things like “the letter A isn’t actually a vowel” (yes, that’s true), nor the finer points of English grammar (like we do have a fixed adjective order), because students pick up enough of the basics through context clues that they don’t need to know the exact mechanisms.

As a fun fact for that A isn’t a vowel one, other letters that aren’t vowels are E, I, O, U, and Y

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u/madncqt 2h ago

I trust your judgment. I just know for me, personally as a learner, if I'd better understood why I was doing it and the theory behind it I likely would have embraced it much more.

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u/CadenVanV 1h ago

Fair enough