证明线段相等是几何证明中最重要的一类题型，它是几何证明的基石．学习几何，一定要牢牢掌握证明线段相等的基本思路和基本方法．初二同学学完《相似形》一章后，证明线段相等的思路和方法已基本确定，为了帮助初二同学系统而牢固地掌握证明线段相等的基本思路和基本方法，我 It is proved that the equality of line segments is the most important type of problem in geometrical proof. It is the cornerstone of geometrical proof. Learning geometry, we must firmly grasp the basic ideas and basic methods to prove that the line segment is equal. After the second graders finished the chapter of “Similar Shapes”, the ideas and methods for verifying that the line segments are equal have been basically determined. To help students in the second grade system to firmly grasp the basic ideas and basic methods for the proof line segment, I