高考试题中的立体几何题,常以简单几何体为依托,讨论其中线和面的相对位置及空间角的计算,其中不少题呈现的不是标准的几何体,而是经过截割的多面体,从而增加了识图的难度.如果能够通过补形构造出几何体的本来面目,将会使难度得到大幅度降 The three-dimensional geometric questions in the high test questions often rely on simple geometry to discuss the relative positions of the lines and faces and the calculation of the spatial angles. Many of the questions present are not the standard geometry but the cut polyhedron, which increases the number of questions. The difficulty of knowing the map. If you can construct the geometry of the original through the complement, will make the difficulty greatly reduced