人教版数学课本八年级上册(2013年版)第32页第4行给出了全等三角形的对应边、对应角的定义:“把两个全等的三角形重合到一起,重合的顶点叫做对应顶点,重合的边叫做对应边,重合的角叫做对应角.”由此我们可以看出得出对应边、对应角定义的前提是“三角形全等”.那么我们可以以此类推:相似三角形的对应边、对应角的前提是“三角形相似”.在九年级下册课本(2009年版)第27章没有给出相似图形的对应边、对应角的定义.第一次出现“对应 PEP (8th ed.) (2013 edition) Page 32, line 4 gives the corresponding edges of congruent triangles, corresponding to the definition of angle: ”The coincidence of two congruent triangles together, the coincident vertices are called Corresponding vertices, the coincidence edge is called the corresponding edge, coincidence angle is called the corresponding angle. “Thus we can see that the corresponding edge, the corresponding definition of the angle of the premise is ” triangle congruent “. Then we can and so on : Corresponding edge of similar triangles, the corresponding corner of the premise is ”Similar to the triangle.“ In the ninth grade textbook (2009 Edition) Chapter 27 does not give the corresponding figure similar to the corresponding edge, the definition of the corresponding angle. ”correspond