The correct solution of this problem requires knowledge of symmetry, folding, rotation and translation, and it will be more difficult to analyze it from other ideas.

This kind of question is also called open-ended question. The so-called open question is to examine students' learning potential and ability to continue to develop, to examine students' ability to analyze and solve practical problems by using mathematical knowledge, and to let students give full play to their creativity.

So how can we improve our ability to solve such problems?

First of all, we should improve our understanding of such problems, and take improving hands-on ability as an important content of junior high school mathematics. As a universally applicable technology, mathematics is not only a science of thinking, but also an experimental science. It needs to carry out some exploratory activities frequently, such as interest rate calculation, taxation, insurance, measurement, origami, puzzles and so on. At the same time, do a good job in practical homework in textbooks and integrate theory with practice. By practicing homework and exploring activities, we can apply what we have learned to practice.

If you have the conditions, you can read some books and do some "Olympic math" questions. Mastering some ideas and methods of doing Olympic math problems (because some exploratory problems are Olympic math problems themselves) can broaden your thinking and improve your thinking ability.