研究课题　圆柱面上的椭圆在圆柱侧面展开图中形状的研究 .本课宗旨　通过探讨圆柱面上的椭圆在圆柱侧面展开图中的形状 ,引导学生综合运用立几、三角、解几等知识分析问题 ,培养学生在知识交汇处发现问题、解决问题的能力 ,帮助学生构建知识网络 .教学过程　1　提出问题图 1　 Research topics The study of the shape of the ellipse on the cylindrical surface in the development of the cylindrical side view. The purpose of this lesson is to explore the shape of the ellipse on the cylindrical surface to develop the shape in the side of the cylinder to guide students in the comprehensive use of the vertical, triangular, solution and other knowledge analysis. Problems, develop students’ ability to find problems and solve problems at the knowledge exchange, and help students build knowledge networks. Teaching Process 1 Ask Questions Diagram 1