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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It’s hard to measure the outside of a circle(circumference). You can’t use a ruler because it’s straight and a circle is not and you can’t use some sort of circular tool because each circle would be unique relative to the tool. But you can measure the diameter quite easily. Its just a straight line.
Through some mathematicians’ work we have learned the ratio of the diameter to the circumference. This ratio is pi or 3.14. What this means is that as the diameter grows the circumference grows 3.14x as fast.
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