三さん平へい方ほうの定てい理り

noun

Pythagorean theorem

The mathematical theorem that in a right triangle, the square of the hypotenuse equals the sum of the squares of the other two sides. Commonly taught in Japanese junior high school mathematics.

See also: ピタゴラスの定理

• 三さん平へい方ほうの定てい理りを使つかって、直ちょっ角かく三さん角かく形けいの斜しゃ辺へんの長ながさを求もとめます。

  Using the Pythagorean theorem, we find the length of the hypotenuse of the right triangle.