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I measured the top of Khaphre's pyramid using Google Earth West to East. It's value is 4.58 meters. Thus the half base is 2.29 meters. If the slope is 266/(411.154/2) then the missing height is
h1 = 2.963 m = 5.6595 rc
This means that the original height was:
h2 = h1 + h(present) = 260.5 rc + 5.66 rc = 266.16 royal cubits = 139.345 m
The 260.5 rc value is accourding to Guardian Egypt. We need to check to see if this is valid.
The volume of the pyramid is in this case:
V = (215.26246 m)^2 x 139.345 m /3 = 2152391 m^3 = 14997865 (royal cubits)^3