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两条直线被第三条直线所截，构造了八个角，一般称为“三线八角”．同学们在学习这部分内容时，要注意把好两道“关”．一、定义“关”如图1，当两条直线a、b被第三条直线l所截时，就构成了八个角，其中没有公共顶点的角可分为三类．1．同位角：分别在截线同劳且位置相同的一对
The two straight lines are truncated by the third straight line, constructing eight corners, commonly called “three lines and eight horns.” When students learn this part of the content, they should pay attention to two “off.” First, the definition of “off” in Figure 1, when the two lines a, b are cut by the third line l, it constitutes eight corners, where there is no common vertex angle can be divided into three categories. 1. An azimuth angle: a pair of identical positions in the same line