在解(证)有一定难度的几何问题时,条件并不明显,而寓于概念、存于性质或含于图中,审题时,就要注意深入挖掘这些隐含条件和信息,常常需要添加辅助线.应如何添加辅助线呢?可以说没有一成不变的方法,应因题而异,采用灵活多变的添加的方法,一般补成常见的基本图形,为顺利解(证)题目创造条件.下面通过例题说明怎样捕捉题设和图形中有用的信息源,通过多种思维产生新的有用信息,进而采用“补形”的方法,达到简捷解(证)问题的目的. In the solution (card) a certain degree of difficulty of the geometric problems, the conditions are not obvious, but in the concept of existence in nature or included in the drawings, examines the topic, we should pay attention to dig deeper into these hidden conditions and information, often need to add auxiliary How to add auxiliary line? It can be said that there is no immutable method, should be due to the problem, using flexible addition method, usually make up the common basic graphics for the smooth solution (card) subject to create the conditions. Through the example of how to capture the title and the source of useful information in the graphics, through a variety of thinking to generate new useful information, and then use “complement ” method to achieve the purpose of simple solution (card) problem.