1. Determine the central theme: First, determine the central theme of your mind map. For parallelogram and trapezoid, we can take them as part of the central theme. For parallelogram, its key attributes may include "two groups of parallel sides", "equal length of opposite sides" and "diagonal bisection".

2. Add related concepts: After listing the key attributes, you can add mathematical or geometric concepts related to these attributes. For example, "the area of parallelogram can be calculated by base × height" and "the area of trapezoid can be calculated by (upper base+lower base )× height /2" and so on.

3. Hierarchy: In order to make your mind map more organized, you can organize it according to the relationship between concepts. For example, the definition of trapezoid can be placed under the difference between parallelogram and trapezoid, and the nature of parallelogram can be placed under the definition of parallelogram.

The benefits of mind mapping

1, improve understanding and memory: By drawing mind maps, complex information and knowledge points can be organized in an orderly way, which is helpful for better understanding and memory. Mind mapping encourages the use of nonlinear elements such as images, colors and spaces, which can stimulate many areas of the brain and improve divergent thinking and innovative ability.

2. Reduce the learning difficulty: For some difficult concepts or knowledge points, it can be presented more intuitively and vividly by drawing mind maps, which helps to reduce the learning difficulty. By drawing mind maps, boring knowledge can be made lively and interesting, and the fun and motivation of learning can be increased.

3. Promote teamwork: In team work, drawing mind maps can better coordinate the tasks and responsibilities among members and improve the efficiency of team cooperation. Mind mapping can help people better analyze and solve problems, find the root of problems through structured thinking and formulate effective solutions.

4. Improve the ability of time management: By drawing mind maps, tasks and time arrangements can be presented in a visual way, which is helpful to better plan and manage time. By drawing a mind map, you can better understand your own way of thinking and expression, which is helpful to improve your self-cognition and expression ability.