1. Prepare a piece of paper and a pencil, and draw the theme or title of the mind map with a pencil.
2. Draw a rectangular box around the theme or title, which will be the boundary of the whole map.
3. Divide the rectangular frame into several equal small squares. This step can be assisted by a ruler or a square.
4. Draw a small circle on the four corners of each small square to indicate the connection points of the frame.
5. Lightly blacken the inner edge of each small square to highlight the outline of the border.
6. Finally, you can draw the border again with tools such as markers or markers, and add tables or other design elements to make the mathematical mind map more beautiful.
The above is how to draw the boundary of mathematical mind map. Remember to check and trim the lines and graphics after painting to ensure the beauty and clarity of the guide map.