[eli5] Why pie ? Can’t 1m form the circumference of a circle. why can pie form a prefect circle ?
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It is spelled “pi”, which is the English/Latin spelling of the Greek letter π.
The circumference of a circle can be anything you want it to be. What pi says, is that the relationship between the circumference and the diameter is always the same. That is, the length circumference is *always* the length of the diameter times pi.
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