Quote '1.8 feet = 21.6ins
1.728feet = 20.736ins
difference = 0.864ins(0.72feet) "
Yep you may notice for example the Olympic foot 12.96 inches x 2 = 25.92 / 12 = 2.16.
These people were singing from the same song book and you can see it. The Kings Chamber (412.5 inches is one key x 2 825) one datum point for width and length is a constant.
The ancient units the Roman Greek Imperial (although not known as the imperial) and Saxon/Indus and probably Chinese had a common base. I think anyway.
And numbers such as 94 when multiplied the best value for pi produce a synodic month 29.5309 must have fired the ancients to study astronomy and conclude the universe may also be able to be measured.
Digit 0.825 inches x 16 = 1 Indus foot 13.2 inches = 1.1 imperial feet
Digit 0.825 inches x 25 = 1 Royal cubit 20.625 inches = 1.71875 imperial feet
Digit 0.825 inches x 24 = 1 Standard cubit 19.8 inches = 1.65 imperial feet