我们知道:过不共线的三点作一多面体的截面,只需作出不共线的三点确定的平面与多面体的各可能相交平面的交线即可;又因为两点确定一直线,故只需作出两相交平面的两公共点即可.正方体截面的作法问题是立体几何中的常见问题,也是同学们学习的难点,本文给出正方体截面的作法两例, We know that if the three points are not collinear and the cross section is a polyhedron, we only need to make the intersection of each possible intersecting plane of the non-collinear three points and the polyhedron. Because the two points are defined as a straight line, Just to make two intersecting plane of the two common points can be.Cube body cross-section approach is the three-dimensional geometry of the common problems, but also difficult for students to learn, this article gives the cube section approach to two cases,