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平行线是初中平面几何最基本、也是非常重要的图形,它的用处很多.解题时,若能根据题目的特点,恰当地添加平行线,就可巧妙转移线段和角,使一些较复杂的问题变得容易.
The parallel line is the most basic and very important figure in the plane geometry of junior middle school. Its usefulness is very large. If you can solve the problem, if you can add parallel lines according to the features of the problem, you can skillfully transfer the lines and corners to make some of the more complicated ones. The problem has become easy.