Universal Measuring Boxes
Since the old days of Japan, there were many ingenious convenient tools that applied mathematical ideas such as the right-angled scale (kanejaku), and the measuring box (masu). The kanejaku is a right-angled scale that was used to find the center and diameter of a circle (Fig. 11.1.1 (a)). On the other hand, the masu is a simple wooden box with no markings whose volume is, in this example, 6 dL. Using this box we can measure 1 dL, 2 dL, 3 dL, and so on in units of 1 dL up to 6 dL [1, 4].
KeywordsMaximum Cardinality Rectangular Parallelepiped Triangular Prism Universal Measuring Triangular Basis
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- J. Akiyama et al., Math Wonderland (Wonder Sugaku Land) (in Japanese), 15-23, NHK (1998)Google Scholar