The construction mode of mathematical mind map is to determine a central theme, lead out sub-themes, and then divide the sub-themes into levels. The specific operation steps are as follows.

Attack the mathematical theme to be drawn with the simplest language. Take "angle measurement" as an example. As shown in the figure below. An angle is a figure composed of two rays drawn from a point. So get to know the rays first. As shown in the figure below. Draw line segments and straight lines with rays and compare their similarities and differences. As shown in the figure below.

Extended data:

Hand-drawn method of mind mapping;

1, draw the theme content in the center of blank drawing paper with colored pen;

2. The secondary themes extend around the central theme in turn;

3. In the second-level theme node, you can continue to expand the next-level theme according to the content;

4. Use colored pens with different colors to improve the content of each branch. Improve the content

5. Check and use the drawn mind map as a whole to ensure the correctness of the drawn mind map.