島根農科大学研究報告

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島根農科大学研究報告 11
1963-01-31 発行

簡単な平面図形の名称

Name of a Simple plane Figure
新宮 忠雄
ファイル
内容記述(抄録等)
Plane figures with some segments and arcs or circles are very easy to draw down, yet thereare some of them which have no specified names. I picked up one of them here. It is acombination of a sector and a circular ring; see the figures 3, 1 and 2. This combinationshown in the figure 3 is now called to be a part of a circular ring, but this does not showits idea distinctly. I could not find the proper name for this figure neither in English norin Japanese. I name it a sector base or a sector subring. I could also name it a circularsubring, but in doing so it is very confusing with the word subring used in abstract algebra.