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,其中不少题不是呈现标准的几何体(如正方体、长方体等),而是经过截、割后的多面体,从而增加了解题的难度,如果能够通过补形 Stereo geometry problems, often relying on simple geometry, to discuss where the relative position of the line and the surface and the calculation of the spatial angle, many of which are not the standard geometry (such as cuboids, cuboids, etc.), but after cutting, cutting Polyhedron, thereby increasing the difficulty of solving problems, if can through the shape