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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Pi is the ratio between every circle’s circumference and its diameter. It wasn’t created, it’s just a mathematical constant that exists.
It actually tends to pop up in many different places in math – anything that has to do with circles or cycles for example. Also circles are pretty common in math and physics.
The reason it has “so many digits” is because it’s irrational. Irrational numbers are numbers that can’t be expressed as a division of two integers. This isn’t a rare thing – there are many other irrational numbers, such as the square roots of 2, 3, 5, and others. In fact, there are more irrational numbers than rational numbers! Being irrational is one of Pi’s *least* interesting properties.
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