（一）知识要点本单元的内容可以分为四大部分：一是王角形的有关概念和性质；二是全等三角形的概念、性质、判定及应用；三是特殊三角形的概念、性质、判定及应用；四是轴对称和轴对称图形的概念、性质和基本作图．本单元的重点是全等三角形的定义、性质、判定和应用．一、三 (I) Knowledge points The content of this module can be divided into four major parts: First, the related concept and nature of the king’s shape; Second, the concept, nature, judgment and application of the congruent triangle; Third, the concept, nature and judgment of the special triangle And application; the fourth is the concept, nature and basic drawing of axisymmetric and axisymmetric graphs. The focus of this module is the definition, nature, determination and application of congruent triangles. one three