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有此几何题,只从图形本身求解较难或不能求解,若能根据已知条件及证题的需要,将原图形补成特殊的图形,常能使问题的本质特征得到显现,有效找到解题途径．
With this geometrical problem, it is difficult or impossible to solve only from the graph itself. If the original graph can be made into a special graph according to the known conditions and the requirements of the questions, the essential characteristics of the problem can often be revealed and the solution can be found effectively. Problem approach.