I understand that it IS pi, but I don’t understand what “ratio of the circumference of any circle to the diameter” means.
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Pick a circle, any circle. Determine the circumference and the diameter (in any chosen unit, millimeters, inches). Divide those numbers. The result is pi.
In reality pi is not directly related to circles, it’s just historically (and technologically) important. Pi is a property of the (complex) exponential function. And if you know anything about math, it’s the most important function.
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