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三视图的识别和应用是近年高考的常考内容之一,在高考试题中常以选择题和填空题的形式出现,注重与立体几何中有关的计算问题融合,形式灵活.在解答这类问题时,通常需要将三视图还原为空间几何体.本文介绍三视图还原多面体的方法模型.一、方法原理说明图甲为长方体,P’、P分别位于上、下底面上且PP’与底面垂直.线段PP’是某多面体的一条棱,在该多面体的左视图、正视图中,线段PP’如图乙所示(线段
Three views of the identification and application of college entrance examination in recent years, one of the most often test content, often in the entrance examination questions to fill in multiple choice questions and fill in the form of blank, focusing on three-dimensional geometry with the calculation of the integration of issues related to the form of flexible. , Usually need to restore the three views into spatial geometry.This paper describes the three-view reduction method of polyhedron model.First, the method principle that Tujia is a rectangular parallelepiped, P ’, P are located on the upper and lower bottom surface and PP’ PP ’is an edge of a polyhedron. In the left view and the front view of the polyhedron, the line PP’ is as shown in FIG.