1. Use the simplest language to determine the mathematical theme to be drawn. Take "angle measurement" as an example, as shown in the figure below.

2. The angle is a graph composed of two rays drawn from a point, so start with the rays, as shown in the figure below.

3. Draw line segments and straight lines with rays and compare their similarities and differences. As shown in the figure below.

4. Mark the angle of key knowledge points on the mind map. As shown in the figure below.