《北师大版·数学》七年级下册第二章平行线与相交线图1中介绍同位角、内错角、同旁内角时,采用的方式是:如图1具有∠1与∠2这样位置关系的角称为同位角;具有∠2与∠3这样位置关系的角称为内错角;具有∠3与∠4这样位置关系的角称为同旁内角。过于单一的模拟描述,对于初学者要想 In Chapter 1, Parallel Lines and Intersection Lines in Figure 1 are used to describe the azimuth angle, the inner angle error angle, and the side angle, as shown in Figure 1 with ∠1 and ∠2. The angle of this positional relationship is referred to as an isosmoid angle; angles having a positional relationship such as ∠2 and ∠3 are referred to as an internal misalignment angle; angles having a positional relationship such as ∠3 and ∠4 are referred to as a same-sideward angle. A single simulation description, for beginners