The Pythagorean Theorem, attributed to the Greek mathematician Pythagoras, represented a major step forward for geometry. The theory holds that in any right-angled triangle, the square of the hypotenuse equals the sum of the squares of the remaining two sides. Another significant contribution by Pythagoras was the theorem that the sum of the angles of any triangle equals 180 degrees. A Pythagorean discovery in acoustical science stated that the notes made by a stringed instrument relate to the lengths of the strings. Additionally, the Pythagoreans noted and accepted that the Earth is round.
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