A history of Greek mathematics : Heath, Thomas Little, Sir, 1861-1940 : Free Download, Borrow, and Streaming : Internet Archive

I. From Thales to Euclid.--II. From Aristarchus to Diophantus

Page to him. But, lastly, the se-qet in No. 56 is ff and, if se-qet is taken in the sense of cot HFE, this gives for the angle HFE the value of 54° 14' 16'', which is precisely y to the seconds, the slope of the lower half of the southern stone pyramid of Dakshur; in Nos. 57-9 the se-qet, |, is the cotangent of an angle of 53° 7' 48", which again is exactly the slope of the second pyramid of Gizeh as measured by Flinders Petrie ; and the se-qet in No. 60, which is J, is the cotangent of an angle of 75° 57' 50", corresponding exactly to the slope of the Mastaba-tombs of the Ancient Empire…

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