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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Its easiest to understand by [seeing it visually here](https://upload.wikimedia.org/wikipedia/commons/4/4a/Pi-unrolled_slow.gif)
Think of it not as a circle to start but as a single straight line. What happens when you curl that straight line up into a circle?
Any circle will be the same. Pi. When you uncoil a circle, you always get the ratio of circumference to diameter is 3.14…
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