“图形的全等”是初中几何教学继平面图形的认识之后,又一次带领学生走进了对平面几何的认识,发展学生合情推理的能力和初步的演绎推理能力,既是本章的重点之一,也是难点所在.受教材编排的启发,我选择探索角平分线的更多可行的画法以及利用角平分线构造全等三角形作为复习全等三角形最后习题课的题材.来源于教材又有螺旋式上升的延伸与扩展.分析书上的画法可知:要作出角平分线只要构造一对全等三角形.引导学生类比书中的作图,运用所学知识探索新的作 “Graphics congruent ” is the geometric teaching of junior high school after following the understanding of plane graphics, once again led students into the understanding of plane geometry, the ability to develop students reasoning reasoning and the initial deductive reasoning ability is not only the focus of this chapter One of the difficulties is also.Inspired by the textbook layout, I chose to explore more feasible method of angle bisector and the use of angle bisector to construct congruent triangle as the theme of reviewing the final triangle of congruent triangle. There is a spiral of extension and expansion analysis of the book shows that: to make an angle bisector as long as the construction of a pair of congruent triangles to guide students in the analogy of the map, the use of knowledge to explore new work