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本文介绍相似三角形的一个基本图形及其在解题中的应用,并从几何变换的角度,将此基本图形进行变形和拓展,进而揭示几种基本图形之间的内在联系,从而使我们的知识更加系统化.一、两个三角形相似的一个基本图形如图1所示.AC2=AD·AB.(2)如果下列三个条件中任意一个成立:∠ACD=∠B
This paper introduces a basic graph of similar triangles and its application in solving problems. From the perspective of geometric transformation, this basic graph is transformed and expanded to reveal the intrinsic relationship between several basic graphs, thus making our knowledge More systematic. A basic graph similar to two triangles is shown in Figure 1. AC2=AD·AB. (2) If any of the following three conditions are true: ∠ ACD=∠B