Licks, H. E · New York, D. Van Nostrand company · leaf 68
to expand and maintain its symmetry or proportions, it would expand along these four lines. Any solid can there- fore be considered a cross section of its greater self. The foregoing is the only practical demonstration that can be given of four dimensions." 87 ON THE AREA OF A CLOSED TRIANGLE From… … Rg. ti fig- £2 to determine the area of a combination of loops. Thus, consider the figure of eight in Fig. 21 which has two loops; if we go around it continuously in the direction indicated
Mathematical recreations
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