Plane trigonometry

Japanese: 平面三角法 - へいめんさんかくほう
Plane trigonometry
〘 noun 〙 In mathematics, one of the methods of trigonometry①. It is a method of studying the relationship between the sides and angles of a triangle on a plane, as well as its area, using trigonometric functions. It is also applied to physics, industrial technology, etc. [English-Japanese Dictionary of Mathematical Dictionary (1889)]

Source: The Selected Edition of the Japanese Language Dictionary About the Selected Edition of the Japanese Language Dictionary Information

Japanese:
〘名〙 数学で、三角法①の一つ。三角関数を用い、平面上の三角形の辺と角との関係、面積などを研究しようというもの。物理学、工業技術などにも応用される。〔数学ニ用ヰル辞ノ英和対訳字書(1889)〕

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