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线与圆的位置关系是高考的常客,特别是关于求解最值的问题:当直线与圆相离时,求圆上点到线的最小距离或最大距离.对于这类问题的考查可谓花样迭出,其设问方式各式各样,但解题时我们只要抓住问题的实质,即可让它万物归宗.下面就让我们把它统一成一类问题进行学习吧.
The relationship between the line and the circle is a frequent visitor to college entrance examination, especially on the solution to the problem of the most value: When the straight line and the circle away from the circle on the line to find the minimum distance or maximum distance. There are a variety of ways to ask questions, but as long as we grasp the essence of the problem, we can make it all belong to the following. Let’s take it as a unified problem to learn.