“有效的数学学习活动不能单纯地依赖模仿与记忆,动手实践,自主探索与合作交流是学生学习数学的重要方式”是新课程倡导的基本理念之一。这节课只要学生真正理解了扇形的弧长,半径与原来圆锥底面周长,母线之间的关系,求圆锥侧面积和全面积的问题就迎刃而解了。所以设计上让学生亲自反复动手操作实践探索其中之间的关系上 “Effective mathematics learning activities can not rely solely on imitation and memory, hands-on practice, independent exploration and cooperation and communication is an important way for students to learn mathematics” is one of the basic concepts advocated by the new curriculum. In this lesson, as long as the students really understand the relationship between the fan arc length, radius and the original cone bottom perimeter, and the busbar, the problem of finding the area and full area of ​​the cone side is solved. Therefore, the design allows students to repeatedly practice and explore the relationship between them.