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在处理侧棱垂直于底面且底面有一个直角的棱柱、棱锥问题时,若直接求解困难,则可根据题设条件,构造相应的长(正)方体,然后运用长(正)方体的性质去解决问题.下面举例予以说明.
When dealing with prismatic and pyramidal problems where the side ribs are perpendicular to the bottom surface and the bottom surface has a right angle, if the direct solution is difficult, the corresponding long (positive) cuboids can be constructed according to the conditions and then the long (positive) cuboids can be used. Nature to solve the problem. Here is an example to illustrate.