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讨论内容：对角的概念的认识老师：角是几何中最基本的概念，也是后面学习的基础．对角的认识大家可以随便谈．李明：角的概念为什么要用两种说法？王刚：这两种说法是一致的，它们都是用射线来定义角．一是“有公共端点的两条射线组成的图形叫做角”；一是“角可以看成是一条
Discussion: Understanding the concept of diagonal angles Teacher: Corner is the most basic concept in geometry, and it is also the basis for later learning. Diagonal understanding we can talk casually. Li Ming: Why does the concept of angles use two kinds of arguments? Wang Gang: The two arguments are the same. They all use rays to define the angle. The first is that “the figure composed of two rays with common endpoints is called a corner”; the first is that “angle can be seen as a