全等三角形是初中几何的重点内容之一,也是中考要考查的重要内容.同学们在初学时,由于对概念、判定、性质的理解不深入,往往会出现这样那样的错误.下面就常见的解题错误进行分析,希望能引起同学们的警惕.一对“对应”二字认识不准确例1如图1所示,△ABC中,∠A=30°,∠B=70°,AC=17cm;△DEF中,∠D=70°,∠E=80°,DE=17 cm.那么,△ABC与△DEF全等吗?为什么? Congruent triangle is one of the key contents of junior high school geometry, and it is also an important content to be examined in the middle school. When the students begin to learn, because of the lack of understanding of the concept, judgment, and nature, errors of this kind often occur. The following common ones Solve the problem of mistakes for analysis, hoping to arouse the vigilance of the students. A pair of “corresponding ” two words inaccurate example 1 shown in Figure 1, △ABC, ∠A=30°, ∠B=70°, AC = 17cm; △ DEF, ∠ D = 70 °, ∠ E = 80 °, DE = 17 cm. Then, △ ABC and △ DEF equal? ​​Why?