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一、知识要点1.长方体和正方体表面积的意义:长方体或者正方体6个面的总面积叫作它的表面积。2.长方体和正方体表面积的计算方法:长方体的表面积=(长×宽+长×高+宽×高)×2;正方体的表面积=棱长×棱长×6。3.长方体和正方体表面积的应用:求长方体和正方体表面积在实际生产、生活中应用比较广泛。如:(1)计算装修房屋、粉刷墙壁、蓄水池铺瓷砖等的面积。(2)计算制作的长方体、正方体的铁桶、包装盒、鱼缸、通风管等所需要的原材料面积。
First, the main points of knowledge 1. The significance of the cuboid and cube surface area: the total area of 6 cuboid or cuboid surface is called its surface area. 2. The calculation of the cuboid and cube surface area: the surface area of the cuboid = (length × width + length × height + width × height) × 2; the surface area of the cube = edge length × edge length × 6.3. The application of cuboid and cube surface area : Seeking cuboid and cube surface area in the actual production, life is more widely used. Such as: (1) calculate the decoration of houses, painted walls, such as the area of the reservoir shop tiles. (2) Calculate the area of the raw materials required for the rectangular parallelepiped barrels, packaging boxes, aquariums and ventilation ducts.