You can totally have a circle with a circumference of 1.
Such a circle would have a diameter of 1/pi
If the diameter is a whole (or even just a rational) number then the value for the circumference will have to have pi multiplied by something.
If the circumference is a whole (or even just a rational) number then the value for the circumference will have to have pi^-1 multiplied by something.
They can’t both be whole numbers or even just ratios of whole numbers.
This is what they mean when they talk about squaring the circle.
You can’t do it either one value or the other (or both) have to have an irrational component.
It is spelled “pi”, which is the English/Latin spelling of the Greek letter π.
The circumference of a circle can be anything you want it to be. What pi says, is that the relationship between the circumference and the diameter is always the same. That is, the length circumference is *always* the length of the diameter times pi.
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