As RS Aggarwal's class 11 Chapter 14 explains, the Sexagesimal System is a way to measure angles in which degrees, minutes, and seconds are used. The English system is another name for it. In the Sexagesimal System, a right angle is split into 90 parts, and each part is called a degree. When you divide a degree into 60 equal parts, you get a sexagesimal minute. On the other hand, the Centesimal System uses seconds, minutes, and grades to measure angles. Here, a right angle is divided into 100 equal parts instead of 90, and each part is called a grade. When you divide 100 by 100 again, you get centimetres.