<human>:  Where does the name ‘Pythagorean theorem’ come from?
<bot>: The Pythagorean theorem is named after Pythagoras, who lived in ancient Greece. He was a mathematician and philosopher who studied the properties of numbers and shapes. He is most famous for his theorem that states that in a right triangle, the square of the length of the hypotenuse is equal to the sum of the squares of the lengths of the other two sides.