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You can't have 57.6 degrees as a Radian - they didn't use a degree system.

You really are getting desperate Dave.
360 part division of the circle goes with the year, decans and the degree.
[aleph0.clarku.edu]

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The 533mm/21" rods are not Royal cubits, they are Levantine measures from the Iron Age.

Very good. Mesopatamian rods. They go with the sumerian system of 20" inches cubits. [en.wikipedia.org]

They also go with the royal egyptian foot based on a 4 cubit fathom of
144/7 inches = 20.5714

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139. Of these engraved lists the first two have a unit of a decimal division of the cubit; in No. I the spaces are 16/100 of a cubit wide, and 20/100 high, or 4/25 and 5/25; and in No.2 the spaces are 14/100 wide, and 16/100 high, or 7/50 and 8/50. The cubit of No. I would be 20.45 ± .05, and of No.2, 20.58 ± .08. This is of course inferior as a cubit standard to the determinations from large buildings but it is very valuable as showing the decimal division of this cubit, which is also found in other countries.

[www.ronaldbirdsall.com]
20.5714 * 4/6 = 13.714 inches (root - royal egyptian - J Neal)
20.5714 * 4/7 = 11.755 inches (root - common egyptian - J Neal)

Hence

144/7 = 20.571428 = 100
14.4 * v2 = 20.364675 = (mean by scale)
12 * (24/25) = 20.16 = 98