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几何体和旋转体之间的“切”与“接”的问题,是学习立体几何的一个难点,也是高考中常考的一类问题。究其原因主要是图形较复杂,不好画,画出来了也不好看,分析起来必然会碰到困难,另一方面是切与接的两个几何体之间的线元素不知哪里发生关系,也增加了问题的难度。
The problem of “cutting” and “connecting” between the geometry and the rotating body is a difficult point to learn the three-dimensional geometry. The main reason is the graphics are more complex, not good to draw, draw it is not good-looking, analysis will inevitably encounter difficulties, on the other hand is cut and then the line between the two geometry elements do not know where the relationship between Increased the difficulty of the problem.