The last question of 20 10 Beijing senior high school entrance examination is really a bit difficult, I think it's a bit out of line!

I remember that there are several ways to solve this problem in the chapter of axisymmetric transformation written by Xiao Zhengang, a small editor of geometric transformation in East China Normal University. It seems to be an 83-year competition question, which is very old, but it is more classic. Direct. It is unfair to treat a question as an examination question. At least it should be changed.