初中平面几何中有切割线定理,该定理在高中数学中有许多巧妙应用,许多高考、高中数学联赛、模拟试题如果能够使用该定理,可以大大改进常规解法,减小思维量和运算量,为考试赢得宝贵的答题时间,下面举例说明切割线定理在解决平面解析几何有关问题中的妙用.1解决张角最大问题例1在 There is a cutting line theorem in the plane geometry of junior middle school. This theorem has many clever applications in high school mathematics. If many the college entrance examinations, high school math leagues, simulation test questions can use the theorem, can greatly improve the conventional solution, reduce the amount of thinking and calculation, The exam wins precious question answer time. Here is an example to illustrate the magical effect of the cutting line theorem in solving problems related to plane analytical geometry.