会看图,是学好平面几何的难点之一,也是一项重要的基本功。分析图形构成的各元素间不同的位置关系和数量关系,将会发现有以下几种常用图形:一是定义定理所给定的标准图形,也称基本图形,二是由基本图形演变而来的变化图形;三是由几个基本图形组合而成的组合图形。会看图,主要是会运用基本图形。 1.析图一析出基本图形探索证题思路例1 梯形BCED中,DE∥BC,两对角 Looking at the map is one of the difficulties in learning plane geometry, and it is also an important basic skill. Analysing the different positional and quantitative relationships between the various elements of the graph will reveal the following common patterns: First, the standard graph given by the definition theorem, also called the basic graph, and the second, evolved from the basic graph. Change graphics; third is a combination of several basic graphics combined graphics. If you look at the map, you will use basic graphics. 1. Separation of Figure 1 Precipitation of Basic Pattern Exploration Test Ideas Example 1 Trapezoidal BCED, DE∥BC, two diagonals