DavidK wrote: If this is how they worked out area how did they do circumferences?
LOL, Don't know why you are asking this question? Perhaps you missed this when posted a couple of months ago.
If the radius of a circle is one, the perimeter a circumscribing square has a perimeter value of 8 radii. Then 8r / (14/11) = 6 + 1/4 + 1/28r or 44/7 as the circumference
As previously stated the value of 256/81 is our value extrapolated using our methods from RMP problem #50. According to all records, if and only if, 256/81 were known in Ancient Egypt it would be written in unit fraction form as 3 + 1/9 + 1/27 + 1/81.