eli5 Why is the circumference of a circle divided by its diameter always (for the majority) equal to pi?
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If it didn’t, it wouldn’t be a circle. Part of the definition of a circle is that *every* point on the line is the same amount of distance from the center, that distance being the radius. With that rigid of a definition, there’s only one way to change its shape which is to make the whole thing bigger or smaller by a specific proportion.
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