Hambidge, Jay, 1867-1924 · New Haven : Yale University Press · leaf 48
32 DYNAMIC SYMMETRY The total distance AB in Fig. 7, is 1.809. BC is .809, CD is .309, AC is 1 or unity, and AD is unity minus .309, or .691. This fraction .691, is the reciprocal of 1.4472, or a square plus a root-five rectangle. ED is this shape, the key to the Parthenon plan and many other Greek… … Fig. 7. The intersection of two diagonals to the pentagon, in Fig. 8, determines the area shown by the heavy lines, which is composed of two squares and two root-five rectangles or the ratio 1.382. Fig. 8. The distance AB in Fig. 9, is the difference between 1.809 and 2, or .191, and this fraction…
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