有些貌似与圆无关的直线型问题,但问题的题设或结论或图形提供了某些圆的性质相似的信息,此时可大胆联想,构造出与题目相关的辅助圆模型,往往可化隐为显,化难为易,化繁为简,将直线型问题转化为曲线型问题,将原问题转化为与圆有关的问题加以解决,从而降低问题的难度,使问题获得简解、巧解或新解,拓宽解题思路,迅速找到解题的突破口. Some seemingly have nothing to do with the circle of linear problems, but the problem set or conclusions or graphics provide some similar nature of the circle of information, this time you can boldly associate to construct the auxiliary circle model and the subject, often can be hidden For the obvious, the difficulty is easy, the complexity is simplified, the linear problem into a curvilinear type problem, the original problem into a circle-related problems to be solved, so as to reduce the difficulty of the problem, the problem was simplified, clever or The new solution, broaden the problem-solving ideas, quickly find a breakthrough in solving problems.