DB: If you gentleman could point us to the source of you using 197.28 or a base that will give you 279 as a hypotenuse please.
Menkaure's Pyramid was named 'Menkaure is Divine'. Smaller than his predecessors' pyramids at Giza, it has a base area of 102.2 x 104.6m (335 x 343 ft). - Lehner, Dr Mark, 'The Complete Pyramids', p.134
So, 335ft by 343ft = hypotenuse of 479.45 ft.
Convert to inches: 479.45 x 12 = 5753.4 inches.
Convert to Royal Cubits: 5753.4 / 20.618 = 279.04 Rotal Cubits (hypotenuse).
But I guess rounding down to 279 Royal Cubits upsets your penchant for pixel perfection?
Post Edited (04-Feb-12 00:54)