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.

Extended data:

Mind mapping can also be used to organize complex ideas, or as a memory skill. For example, when listening to a speech, you can use a mind map to record the most important words or key points. At this time, mind mapping also promoted a kind of cooperation-colored pen creation meeting.

Mind mapping can be drawn by hand or by some software. For example: rough notes of meetings or speeches, or further requirements for texture;

In August, 2007, Ian Lanchin's The Name of the Dead, the best-selling paperback novel in Britain, specifically mentioned that Agent Reebs used mind maps to solve crimes.