1教学背景对于全等三角形的研究,实际是平面几何中对封闭的两个图形关系研究的第一步。它是两个三角形间最简单,最常见的关系。它不仅是学习后面知识的基础,并且是证明线段相等、角相等的重要依据。因此必须熟练地掌握全等三角形的判定方法,并且灵活的应用。数学新课标指出:数学教学要以现代教育思想和教学理论 A teaching background For congruent triangles, is actually the first step in the study of the relationship between two closed graphics in plane geometry. It is the simplest and most common relationship between two triangles. It is not only the basis for learning the knowledge behind, and is an important basis to prove that the line segments are equal and the angles are equal. Therefore, it is necessary to be proficient in judging congruent triangles and apply them flexibly. The new curriculum standard of mathematics points out that mathematics teaching should take the modern education thought and teaching theory