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一、复习目标1.掌握直线、射线和线段的特征.能正确区分直线、射线和线段。2.认识角的各部分名称。3.能根据角的大小分类。理解锐角、直角、平角、钝角和周角的意义。4.会度量角的度数,掌握画角的方法。二、知识梳理1.直线、射线和线段。直线没有端点,可以向两端无限延长;射线有一个端点,它可以向一端无限延长;线段有两个端点,它可以度量。
First, the review of the objectives 1. Grasp the characteristics of straight lines, rays and line segments can correctly distinguish between straight lines, rays and line segments. 2. Know the name of each part of the angle. 3. According to the size of the corner classification. Understand the meaning of acute, right, flat, obtuse, and perimeter angles. 4. Will measure the degree of angle, grasp the angle of painting methods. Second, knowledge combing 1. Straight lines, rays and lines. Lines have no endpoints and can extend indefinitely to both ends; rays have an endpoint that can extend indefinitely to one end; the segment has two endpoints that can be measured.