First of all, we need to draw the vertex and side of the angle, which coincides with the time of measuring the angle. The vertex and side can be drawn at will, and their position does not affect the degree of the final angle. After completion, we need to make the vertex of the angle coincide with the center of the protractor, and the side coincides with the zero scale line.

When measuring the angle, first put the protractor on the top of the angle, then find the vertex of the angle, make the center of the protractor coincide with the vertex of the angle, and then make the side of the angle coincide with the zero scale line. After completing the two coincidences, we can measure the degree of the angle. Find the other side of the angle and see which scale of the protractor the other side of the angle falls on. At this time, the angle degree is how much.