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三视图作为空间几何体的一种重要呈现方式,在历年的高考题中都有考查,本文结合高考真题,分析如何把三视图还原直观图,从“看”回归到其本质“正投影”。三视图是高中《数学2》(必修)“立体几何初步”中的内容,三视图的学习可以提高直观感知和空间想象能力,为后续学习空间几何体的结构特征以及位置关系服务,而空间几何体的结构特征以及位置关系的学习也对三视图的认识起到强化作用。同时,三视图是新课程改革以来高考必考的知识点,多以选择题、填空题形式
As an important representation of spatial geometry, the three views have been examined in the college entrance examination papers over the years. This paper analyzes how to restore the three-view visualization from the perspective of college entrance examination, “. The three views are the contents of ”Mathematics 2“ (compulsory) and ”Solid Geometry Preliminary" in high school. The study of the three views can improve the visual perception and spatial imagination ability, and serve the structural characteristics and the positional relationship of spatial geometry for subsequent study. Space The structural features of the geometry as well as the learning of the positional relationship also reinforce the understanding of the three views. At the same time, the three views is the new curriculum reform since the college entrance examination will be the point of knowledge, multi-choice, fill in the blank form