What were Euclid and Pythagoras known for?

Euclid is best known for his work in geometry, particularly through his influential book "Elements," which systematically presented the principles of geometry and laid the foundations for the subject. Pythagoras is renowned for his contributions to mathematics, especially the Pythagorean theorem, which relates the sides of a right triangle. Both figures significantly shaped the development of mathematics and its logical structure in ancient Greece. Their ideas continue to influence mathematics and geometry today.