在几何问题中,求最值的问题是热点之一,用两点之间线段最短来求最小值的问题是最常见的.其实,用点到直线距离垂线段最短也是求最值问题的一种重要方法.现举几例说明. In geometric problems, the problem of finding the most value is one of the hot spots, and the problem of finding the minimum value with the shortest line length between two points is the most common. In fact, using the point-to-line distance, the shortest vertical line segment is also one Kind of important methods. Here are a few examples.