> advanced trigonometry

There's a ratio involving pi between the base lengths of the pyramid and its height. This is been interpreted by enthusiasts that the Egyptians knew about pi.

But, consider a measuring wheel, where you can mark off distances very accurately by counting revolutions of the wheel, say, 1 cubit in diameter (I know, I know, what's a cubit?). Then, if the height is laid out in cubits, the ratio of pi is there while being completely ignorant of it.