Lee, happy that you got Stadelmann's book. The third edition, I hope? it got improved numbers. As for the Red Pyramid: Stadelmann gives 420 royal cubits for the base, 200 (sic) royal cubits for the height, and 45 degrees for the angle. This may either be the angle of the first layer of blocks, or of the pyramidion, or of both, while the overall angle must be about 43.6 degrees, as you say. That's no contradiction. You got to consider optical corrections. The Greeks were not the first to make such corrections, for example by slightly curving the long sides of the parthenon on the acropolis of Athens: by slightly curving the lines they appear straight. The same in the case of the Great Pyramid. The lines of the base are leading inward, by some 150 cm, as I recall. Similar optical corrections must have been used for the height. By the way, in another book I found the angle of the Red Pyramid as 44 degrees - 43.6 degrees rounded; this would then be the overall angle.