Hambidge, Jay, 1867-1924 · New Haven : Yale University Press · leaf 49
rocal of 5.236 is .191. (Fig. 11.) 4 + -t- Fig. 11. The area 5.236. The relation of the diameter of the inscribed circle of a pentagon to the diam- eter of the escribed circle is the ratio 1.236, i. e., root five, 2.236, minus 1, or .618 multiplied by 2 (the reciprocal of 1.236 is .809). When the… … Fig. 12.' When four squares are placed in the pentagonal construction, as AB in Fig. 13, the area shown by the heavy lines is composed of two rectangles, each of
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