“课标”指出:“几何学是研究现实世界中物体的形状、大小与位置关系的学科.人们通常采用直观感知、操作确认、思辨论证、度量计算等方法认识和探索几何图形及其性质.”北师大版《数学2》正是遵循这一理念,特别重视长方体这一模型的应用.教材中利用长方体来感知概念、性质和判定的有18处,以长方体 Geometry is a discipline that studies the shape, size and position of objects in the real world.Generally speaking, people usually use the methods of intuitionistic perception, operation confirmation, speculative argumentation and metrology calculation to understand and explore the geometry and Its nature. “Beijing Normal University Edition” Mathematics 2 "is to follow this concept, with special emphasis on the application of the model of the cuboid.Text to use the box to sense the concept of knowledge, nature and determination of 18, with a rectangular parallelepiped