Translation guide
The Pythagorean theorem is a mathematical concept. In Japanese, it is most commonly referred to as 三平方の定理, but ピタゴラスの定理 is also widely understood.
Referring to the geometric theorem that in a right triangle, the square of the hypotenuse equals the sum of the squares of the other two sides.
This is the direct transliteration of 'Pythagorean theorem' and is also commonly used, especially in more academic or international contexts.
The Pythagorean theorem was discovered by the ancient Greek mathematician Pythagoras.