Why is the ratio of the circumference of any circle to the diameter of that circle pi?

Question

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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Answer 1

All circles are similar to each other. That is, they all have the same shape regardless of how we scale them up or down. Squares have the same property. If you measure the width of a square, you will find that it is always 1/4 of the perimeter.