圆柱和圆锥是小学数学中几何知识的最后一部份,内容包括圆柱的表面积、圆柱的体积和圆锥的体积三部份。教学前要认真复习长方体、正方体和圆的有关知识,使学生在旧知识的基础上认真理解新教材。另外,本单元的知识在实际中应用比较广泛,所以要联系实际,直观地进行教学。一、通过观察实物,讲清圆柱和圆锥的定义,可引导学生从汽油桶、圆钢、地上堆 Cylindrical and conical geometry is the last part of elementary mathematics, including the cylindrical surface area, the volume of the cylinder and the volume of the cone in three parts. Before teaching, we should conscientiously review the knowledge of cuboids, squares and circles so that students can carefully understand the new textbooks based on the old knowledge. In addition, the unit of knowledge in practice more widely used, so to contact the actual, intuitive teaching. First, by observing the physical, clarify the definition of cylinder and cone, can guide students from the gasoline barrels, round bar, ground heap