Like, it’s just a number why is it SO specific? Other than circles I can’t think of a use that pie has. Why would we create something that only has one use (that I know of) that is almost always simplified?
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It wasn’t created, more like found. Likely first by whomever needed to know how long rope or such to go around a round thing of some size. First people likely thought it to be just 3 and a bit. The more accurate the need went, the more digit came in. For example building mechanical clocks you need to know very exactly how wheels of different sizes move eachothers, so you need very many digits of pi. It actually has infinite amount of digits, but proving that is beyond my explanation skills.
It is needed practically in every calculation that has anything round, rotating or something to do with angles sooner or later.
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