[ssener2001]

I agree.Obtaining this formula by observing is more difficult than obtaining it by proving it. Besides, it is an issue that is already needed in field work. If you have pen, paper and a good number system, it shouldn't be too difficult to find the formula with shapes.

[loa_in_]

I imagine back then things like number systems and methods of proving were just made up as they go.

[lazide]

Clay tablets and a stylus also less convenient than pen and paper.

[KMag]

That entirely depends on how close you are to high-clay-content muddy bank with a growth of reeds vs. how close you are to the nearest convenience store/office supply store.

[lazide]

Did I just find a new metric to put on my rental house evaluation checklist? Maybe! Haha