Hambidge, Jay, 1867-1924 · New Haven : Yale University Press · leaf 47
SYMMETRY 31 Fig. 1. Fig. 3. In Fig. 4, the point B in reference to the center A, is eighteen degrees and the natural sine of eighteen degrees or the line AC, is .309. This fraction multiplied by 1 equals .618. The rectangle AB, therefore, is composed of two whirling square rectangles, placed end to… … Fig. 4. Fig. 5. A root-five rectangle is composed of a whirling square rectangle, plus its reciprocal, or 1.618 plus .618. Consequently the area shown by the heavy lines in Fig. 6a is composed of two root-five rectangles, and the area in b, defined by heavy lines, is equal to four root-five…
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