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学生初接触几何概念,教师可先让学生课下动手做模型,如在讲长方体、正方体表面积前,老师先给学生看一组长方体、正方体模型,并让学生参照书上的图样用硬纸做:(1)一个长2厘米、宽3厘米、高5厘米的长方体。(2)长、宽都等于4厘米,高5厘米的长方体。(3)制作棱长是2厘米的正方体。同时布置思考题:(1)长方体或者正方体六个面的总面积叫什么?(2)六个面中,上下两个
Students first contact with the geometric concept, teachers can let the students do the class under the hands of the model, such as talking about the rectangular body, cube surface area, the teacher first to students to see a group of cuboids, cube model, and students reference to the book pattern with cardboard : (1) A rectangular parallelepiped 2 centimeters long, 3 centimeters wide and 5 centimeters high. (2) Length and width are equal to 4 cm, 5 cm high cuboid. (3) the production of prismatic length is 2 cm cube. At the same time the issue of thinking questions: (1) the total area of the cuboid or cube six surface area is called? (2) six surfaces, up and down two