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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That’s literally the definition of pi.
If I were to take a circle of diameter d, it’s circumference C will be exactly pi times longer than d.
If I unrolled the circle, it would be just over 3 times longer than the diameter of that circle.
If I rolled the circle along the ground one full rotation, it would travel just over 3 times the diameter of the circle.
C=πd -> π = C/d
That’s all that the ratio of circumference to diameter is saying.
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