我们知道,两三角形相似时若图形位置确定,即对应边确定或对应角确定时,可用“∽”符号表示,反之,只能用“文字”表示,由于对应关系不确定,致使问题往往有多解可能,常需要分类讨论,以相似形中对应关系不确定为背景的问题早已成为中考的热点,现对常见类型解 We know that when the two triangles are similar, if the position of the figure is determined, that is, when the corresponding edge is determined or the corresponding angle is determined, it can be represented by the “∽” symbol. Conversely, it can only be represented by “text”. Because the correspondence relationship is uncertain, the problem is often many. Possible solutions, often need to discuss the classification, the problem of the similarity in the relationship between the background of the uncertainty of the relationship has long been the focus of the exam, is now common solution