Archaic term for the Pythagorean theorem, now almost entirely replaced by ピタゴラスの定理. Found in older mathematical texts.
See also: ピタゴラスの定理
The term 勾股弦の定理 is used in Edo-period Japanese mathematics books.
The modern standard term for the Pythagorean theorem; 勾股弦の定理 is its archaic predecessor.
Archaic kanji spelling for the Pythagorean theorem; the modern standard is ピタゴラスの定理.
Variant archaic spelling using 鈎 instead of 勾.
From Chinese mathematical terminology, where 勾 (base), 股 (height), and 弦 (hypotenuse) refer to the sides of a right triangle. The term was adopted into Japanese mathematics before Western influence.