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一、谈话引入,实物感知师:今天老师给大家带来一个开心派盒子,它是什么形状的?生:长方体。师:关于长方体你知道什么?生:长方体有6个面。师:对,长方体上有面。(引导学生看屏幕)师:长方体上还有什么?仔细看。多媒体演示介绍:两个面相交的线叫做棱,三条棱相交的点叫做顶点。师:下面我们就从面、棱、顶点这三个方面研究长方体的特征。师:哪个研究起来比较简单?
First, the introduction of conversation, physical perception Teacher: Today, the teacher to bring you a happy school box, what is it shape: Health: cuboid. Teacher: What do you know about the cuboid? Students: The cuboid has 6 faces. Teacher: Yes, rectangular face. (Guide students to see the screen) Teacher: What else on the box? Look carefully. Multimedia Presentation Introduction: The intersection of two faces is called the edge, the intersection of the three edges is called the vertex. Teacher: Now we study the characteristics of cuboids from three aspects: face, edge and vertex. Teacher: Which study is relatively simple?