Greek Heritage Month Announcement Announcement #8- ‘Wisdom’ Wednesday, March 11th, 2026 The Pythagorean Theorem is a key math rule discovered by the ancient Greek mathematician Pythagoras. It explains that in a right-angled triangle, the square of the longest side (the hypotenuse) is equal to the sum of the squares of the other two sides. This theorem is still widely used in math today. Pythagoras also made important contributions to music and philosophy.