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在解决问题过程中,由于有些问题不能直接找到已知与未知的联系,这时需要添加辅助线,使隐蔽的条件显现出来,通过集中使用图中的元素,将图形转化为我们熟悉的基本图形,就会想起曾经学过的定义、定理,从而实现未知向已知的转化,不少学生由于没有掌握规律而盲目尝试,结果不能合理地添加辅助线,其实留心一下,有关的问题中还是有一些常用的辅助线,现举例如下.(一)连接两点例1(2013年宁波南三县模拟考)如图1,在平面
In solving the problem, because some problems can not find the known and the unknown directly, then need to add auxiliary lines, so that hidden conditions appear, by focusing on the elements in the diagram, the graphics into our familiar basic graphics , They will think of the definitions and theorems they once learned, so as to realize the transformation from unknown to known. Many students blindly try out the law because they fail to grasp the rules. As a result, they can not reasonably add auxiliary lines. In fact, there are still some problems Some commonly used auxiliary line, for example as follows: (A) connecting two points Example 1 (Ningbo Nansi County in 2013 simulated test) Figure 1, in the plane