“同位角、内错角、同旁内角”是人教版义务教育课程标准实验教科书七年级下册中的一节内容,学生们对这三类角易混淆。在帮助学生学习这三类角时着重讲解了其重点、难点(在复杂的图形中正确辨别),又把教学目标定为以下几点:1.认识同位角、内错角、同旁内角,能在各类复杂的图形中准确地找出这三类角;2.通过观察、交流等活动使学生明确构成同位角、内错角和同旁内 “Co-ordination angle, within the wrong angle, with the side of the corner ” is the PEP Curriculum Standard Experimental Textbook Volume seven in a section, students are confused about these three types of corners. In helping students to learn these three corners of the angle focused on explaining its key points, difficult (correctly identified in complex graphics), and set the teaching objectives as follows: 1. Recognition of co-ordination angle, within the wrong angle, with the next corner, In all kinds of complex graphics can accurately identify these three types of angles; 2 through observation, communication and other activities so that students clearly constitute the same angle, the wrong angle and the same side