Computer: Huawei MateBook 14

System: Windows 10

1, open XMind on the computer desktop.

2. First, determine the central theme: a preliminary understanding of the third unit corner.

3. According to the knowledge points of angles, sub-themes can be divided into types of angles, composition of angles, drawing methods of angles, characteristics of angles and so on.

4, and then add the corresponding knowledge points, as a three-level theme, in turn, added to the back of each knowledge point, you can complete the mind map.