Cube root this required the construction, now known to be impossible, of the length . A method for extracting cube roots appears in "The Nine Chapters on the Mathematical Art", a Chinese mathematical text compiled around the 2nd century BCE and commented on by Liu Hui in the 3rd century CE. The Greek mathematician Hero of Alexandria devised a method for calculating cube roots in the 1st century CE. His formula is again mentioned by Eutokios in a commentary on Archimedes. In 499 CE Aryabhata, a mathematician-astronomer from the classical age of Indian mathematics and Indian astronomy, gave a method for finding
Pennsylvania Route 729 during the 1930s and early 1940s. Pennsylvania Route 729 Pennsylvania Route 729 (PA 729) is a , north–south state highway located in Clearfield County, Pennsylvania. The southern terminus is at PA 253/PA 453 in Gulich Township. The northern terminus is at US 219/PA 879 in Grampain. PA 729 is known by two names along its route. The two names it goes by are Main Street, and more commonly, the Tyrone Turnpike. The route begins at the village of Janesville at an intersection of PA 253/PA 453. The route heads northwest to the town of Glen Hope, where the route has