Answer: To prove geometry, we must know the positional relationship between planes, straight lines and planes, and the mutual positional relationship between points and lines. Understand that three points that are not on a straight line or on a straight line and one point outside the straight line determine a plane. With these concepts, many solutions turn geometric problems into plane problems, and of course there are exceptions. The difficulty of geometry lies in spatial imagination, stressing positional relationship and not drawing; The most difficult problem in geometry is drawing according to the meaning of the question. As long as the picture is done correctly, the problem is basically done more than half. Therefore, more efforts should be made in the drawing of geometry; Even if it is a figure, you can make axonometric drawings of different sides.

I say this, it is difficult to remember and master; I can't remember what others told me, and I can't master it. What are we going to do? We're trying to do more problems. It is necessary to master the methods suitable for your memory through the amount of questions, and master and improve the efficiency and quality of doing questions. Only in this way can we learn the proof of geometry well, which is the best trick. If you can master some knowledge of three views, it will be helpful to learn geometric drawing.