Archimedes lived in ancient Greece, which lacked the current technology, but people of the past had found a way to solve problems of physics, irrigation, construction, and measurement, which together with the math and calculation of the wise Archimides resulted in the creation of Hydraulics, which modernized the primitive irrigation systems, and discovered the force applied on the pulleys, which allowed a single man to move weights that previously could not. The mathematical knowledge of Archimedes allowed him to know that the circumference of a circle is equal to 2 x π xr, where r is the radius of the circle, then calculated the circumference of the circle with known radius, and found the number Pi (3.1416 ... )