By the way, I hated it when I was in the second grade. Auxiliary line I think this thing is not the product of logical reasoning in mathematics at all, but the concrete embodiment of imagination.
Before it's too late, my advice to you is:
1. Practice more. Of course, your teacher and your parents have mentioned this sentence to you many times, but the sea tactics are really the only way for you to sum up each question and add auxiliary lines. If you are not bad at math, I advise you to find a difficult problem of geometric finale to practice, and you will improve faster. If the foundation is not good, go back and read the theorem in the book first and get familiar with it.
2. Memorize more: You may have searched the Internet for formulas and things like that, but it is impossible to say that you have memorized the formulas, and any problems can be solved, because there are countless changes in geometric figures and auxiliary lines are ever-changing, so you need to remember what auxiliary lines you have used for geometric problems, what the specific addition is, or remember the appearance of this figure, which is commonly known as ". Of course, it is good to remember more, so that when you accumulate a certain number of geometry problems, you will sum up the method of adding auxiliary lines, and you will not be embarrassed.
3. Think more: think about the significance of adding auxiliary lines, and don't blindly add auxiliary lines.
Methods: I think the auxiliary line method is playing hard to get, and add auxiliary lines related to the theorem according to the theorem. Or, if your grades are still very low and you are only in Grade Two, you can try to learn the knowledge of Grade Three, and your thinking will be a little stretched.
Of course, maybe you are in high school, because you have to study solid geometry in high school. In short, the auxiliary line method of solid geometry and plane geometry is the same: playing hard to get.
However, there are many solutions to high school geometry problems. You can build a coordinate system, or you can use vectors to analyze geometry, even complex numbers. ...
You may think that high school is terrible, but high school mathematics has no imagination and relies entirely on mathematical operations to achieve the effect of proof, so it is not so hard.
I hope I can help you.