The solutions to RS Aggarwal Class 9 Chapter 13 Geometrical Constructions show how to build an angle with a measure of 60 degrees. First, draw a line segment and give it a name, like AB. Then, put the compass in the middle and draw a small arc with it. Say that we call this point “m.” Then, using m as the center and the same radius as before, we cut another arc on top of the first one. This is called n. Join m and n together and make the line length to make it stand out. This is a right angle of 60 degrees.