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From G & S, page 372. Given an acute angle of 30°, and unit triangles, other side satisfies (1+x)*sin(15°)=x/sqrt(2) so x=.577350269.
This pattern is a member of an interesting class of mathematical patterns.
FROM: TILINGS AND PATTERNS by Branko Grünbaum and G. C. Shephard © 1987 by W. H. Freeman and Company. Used with permission. PP Class 44, [p3lm,c3,d1], IH Class 36.
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