base of 420 cubits, as follows--
Half-base 210
Altitude 267·380304
Apothem 339·988573 (_See Fig_. 73.)
_Fig. 73. (Cheops) _
But to produce the building ratio of 34 to 21, as per diagram Figure 6
or 9, I had to alter it to--
Half-base 210
Altitude 267·394839
Apothem 340°
Thus the theoretical angle of Cheops is 51° 51′ 14·3″, and the
probable angle at which it was built, is 51° 51′ 20″, as per
figure 15.
Cheops is therefore the mean or centre of a system--the slopes of
Mycerinus being a little flatter, and those of Cephren a little steeper,
Cheops coming fairly between the two, within about 10 minutes; and thus
the connection between the ground plan of the group and the slopes of
the three pyramids is exactly as one might expect after examination of
Figure 3, 4 or 5.