Hambidge, Jay, 1867-1924 · New Haven : Yale University Press · leaf 55
DYNAMIC SYMMETRY 39 s ws rs rs y Fig. 27. Fig. 28. In the thirteenth book of the Elements, Euclid proves the relationship of the end, side and diagonal of the whirling square rectangle. Proposition 8 is devoted to proving that diagonals to a pentagon cut each other in the propor- tion of the… … The first six propositions of the 13th book are devoted to the consideration of the relationships of areas described on lines connected with the whirling square rectangle. In the first proposition the geometrical construction brings out the fact that a rectangle, the end of which is .809 and the…
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