Fractions for $\sqrt{2}$, $\sqrt{3}$, $\sqrt{5}$, quasi-pythagorean triples and the appearance of the royal cubit, foot and inch in Egypt during the Old Kingdom. Part II

A. N. Kovalev

Matematičeskoe obrazovanie, no. 1 (2023), pp. 54-66

Résumé

It is hypothesized that in the Old Kingdom, after finding the fraction 47/21 for $\sqrt{5}$, discovered by Shchetnikov when analyzing the proportions of the burial chamber of the Great Pyramid, an inch was introduced as 1/21 of the royal cubit. Examples are given from architecture and religious art in which the inch was used.

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