Learning to associate space vector with plane geometry knowledge can not only make the thinking clearer, but also avoid unnecessary mistakes!

The most important thing to remember is that vectors are invented and used to simplify problems, and so are solving problems! Then all geometric problems must be solved by vectors!

In fact, at first, I thought the vector was magical and it was very convenient to do the problem. However, I did more questions later, and found that some questions were more troublesome and more prone to mistakes. And there may be dependence, weakening and dulling your thinking, which is counterproductive!

Of course, it may not be that serious. As long as you understand it carefully, remember, you must understand it yourself. What I said may be wrong, just for reference. It is best and most useful for you to know your own ideas!

I hope you can understand it carefully and wish you a smooth study!