复杂的几何图形往往是由一些基本图形复合而成的,掌握了基本图形的构成、形式及其性质,就能从复杂图形中解脱出来,从而使证明顺利完成.下面就以“相似形”为例,谈谈基本图形在解题中的应用.“相似形”的基本图形大致有以下五种,如图:1. 图1是“A”字型,图2是“8”字型,它们都由 Complicated geometry is often composed of some basic graphics. Having mastered the composition, form, and nature of the basic graphics, it can be freed from complex graphics, so that the certificate can be successfully completed. The following is based on “similarity”. For example, talk about the application of basic graphics in solving problems. The basic graphics of “similar shapes” are roughly the following five types, as shown in the following figure: 1. Figure 1 is the “A” shape, and Figure 2 is the “8” shape. All by