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Back in ancient times, it was noted that the ratio of the diameter of a circle to the circumference of that circle was constant (ie it did not depend upon the size of the circle). This ratio was called π.

So π was defined as the ratio between the diameter and circumference of a circle. By measuring various circles and doing the calculation of circumference divided by diameter, the ancients found that π was equal to 3.141....

π starts with 3.141 because of the way π was defined and by the physical measurement (and calculation) if it.

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Q: Why does pi start with 3.141?
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