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合同变换是最重要的初等几何变换,与中学几何教学联系密切,是解初等几何问题的有效工具。为了掌握这个工具,我们首先引进有关的概念和性质:(1)反射:反射是这样的变换,它使得平面上的点与点之间建立如下的对应关系:任意点 A 与其对应点 A′所连结的线段都以同一条直线 l 为垂直平分线,这种变换叫做关于直线 l 的反射亦称轴反射,l 叫反射
Contract transformation is the most important elementary geometric transformation. It is closely related to high school geometry teaching and is an effective tool for solving primary geometric problems. In order to master this tool, we first introduce relevant concepts and properties: (1) Reflection: Reflection is such a transformation that establishes the following correspondence between points on a plane: any point A and its corresponding point A’ The connected line segments all have the same straight line l as the vertical bisector. This transformation is called the reflection about the line l. Also known as the axis reflection, l is called reflection.