Why do i use various figures for the sides of the pyramids ? .
Well of course we can never be 100% certain that whatever figure we put down for any of the sides is what was intended, therefor my figures for these sides must always be seen as one possibility among'st many if the most accurate measurements differ by an inch or two per side.
I favour J H Coles 1925 survey for the mean base perimeter which he gives as 36277.6",and given the suggested + or - we only need to adjust by 0.4" to reach my favourite 36278" figure for the mean perimeter.
The biggest difference in the two surveys with regards to the South base side is 3.5", Cole 9073" with quite a big + or - of 30mm at one end and 10 mm at the other. Petries only gives a difference of 0.1" between the North and South base sides, hmm me thinks thats not likely to be what was intended, if one goes along with the idea that the sides are purposely designed to have different lengths to their sides.
So to be clear , there are many possibilities to what was the intended length of the sides, therefor one can only make suggestions withing a + or - range of those previous findings, i could say im very close to what was intended, but then it depends on what you and i regard as close .