The spoke of the wheel is the same length used to measure the blocks. Other comments here have gone into detail. If the height of the blocks is the same as the diameter or radius of the wheel used to measure the base, then the relations will always be some function of pi. You don’t have to know any definition of pi for this to always be geometrically true.





I didn’t make clear, that I mean using something for measuring really large distances, like the length and width of a large building’s base. A typical measure stick would have less stretching than rope, sure, but would also be tedious to measure with. Counting the spins of a wheel as you roll it is trivially easy and quick in comparison. Wood warps, but not really that much.