K型图直接与相似三角形有关,也往往与全等三角形关联.文中以隐性的构建K型图为例,通过添加辅助线,化隐为显,进而找到解题的突破口,破解难点,使问题迎刃而解.数学中有许多重要的基本图形和添加辅助线的方法,需要学生去发现、归纳、提炼,进而应用.解题有法亦有道. K-shaped graphs are directly related to similar triangles, and are also often associated with congruent triangles. In the paper, the implicit K-shape graph is used as an example. By adding auxiliary lines, the hidden lines are hidden, and then the breakthrough point for solving problems is found, and the difficult points are solved. The problem is solved. There are many important basic figures in mathematics and methods for adding auxiliary lines. Students need to find, summarize, refine, and then apply. There are also methods to solve problems.