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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Circumference and diameter are two measures of a circle. Circumference is the length around the outside, and diameter is the “width” if you will, from one part on the edge, through the center, to the opposite side.
For a circle with a diameter of 1 unit, the circumference will be pi units. That is, if you take a string with the length of the diameter and wrap it around the circle, it will take a total of 3.14… lengths to make it all the way around. *edited for better phrasing
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