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It follows from the ratio of circumradius to inradius that the height-to-width ratio of a regular hexagon is 1:1.1547005; that is, a hexagon with a long diagonal of 1.0000000 will have a distance of 0.8660254 or cos(30°) between parallel sides.
[26]: 1–10 Ngục trung thư (Prison Notes) was written in 1913 while Phan was put in jail and facing a death sentence due to a deal between the Liangguang governor and the French Indochina governor. [5]: 5–6 This work was completed just in a few days and has discrepancies with Niên biểu in some important events of the Đông-Du movement.