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Phan Bội Châu (Vietnamese: [faːn ɓôjˀ cəw]; 26 December 1867 – 29 October 1940), born Phan Văn San, courtesy name Hải Thụ (later changed to Sào Nam), was a pioneer of 20th century Vietnamese nationalism.
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.