面积法是解决几何问题的一种独特方法 ,并不多见 .然而正是因为其独特 ,对某些几何题往往会起到奇特的作用 .有一块均匀植草的三角形草地 ,如图 1所示把它分成东、南、西、北四块 ,经过一段时间发现 ,在西边的草地可放牧 5只羊 ,在东边的草地可放牧 8只羊 ,在南边的草地可放牧1 Area method is a unique method to solve geometric problems, but it is rare. However, because of its uniqueness, it will often play a peculiar role on certain geometric problems. There is a piece of triangular grass that evenly grows grass, as shown in Figure 1. It is divided into four blocks: East, South, West and North. After a period of time, 5 sheep can be grazing in the grasslands to the west, 8 sheep can be grazing in the grasslands to the east, and grass can be grazing in the south.