Ok, pi is probably a bit over the head of your average 5 year old. I know the definition of pi is circumference / diameter, but is that really how we get all the digits of pi? We just get a circle, measure it and calculate? Or is there some other formula or something that we use to calculate the however many known digits of pi there are?
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People posted some methods, but none of them are actually used to calculate pi today. Instead, we use formulas for pi that _converge_ very _fast_, meaning that we need to do relatively little to get many digits. One of the best methods is [Chudnovsky’s algorithm](https://en.wikipedia.org/wiki/Chudnovsky_algorithm). Take a look at this monstrous looking formula… yet it allows us to calculate a hundred trillion digits of pi!
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