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在《全等三角形》一章的最后一节,从全等三角形的角度,再次研究了角平分线的性质,并从“正、反”两个方面说明了“角平分线上的任意一点到角的两边距离相等”这个命题的正确性.在解决有关角平分线的问题时,往往需要添加两条垂线段(如图1,通常称这种图形为“双垂直”图形),创造条件运用角平分线的性质.下面举例说明.一、构造“双垂直”图形
In the last section of the “congruent triangle” chapter, from the perspective of congruent triangles, we study again the properties of angle bisector and illustrate the “ The distance from any point to the corner is equal to the correctness of the proposition. ”When solving the problem related to the angle bisector, two vertical segments often need to be added (as shown in Figure 1, this type of graphics is usually called“ double vertical ” Graphics) to create the conditions for the use of angle bisector of the nature of the following examples. First, the structure “double vertical ” graphics