在平面几何中,为了求任意多边形的面积,讲过割补法,在立体几何中,为了研究某些几何体的性质或计算它的体积,也常常把几何体割补成我们熟悉的几何体。例1 (课本128页第17题) 斜三梭柱的一个侧面的面积等于S,这个侧面与它所对的侧梭的距离等于a,求证这 In plane geometry, in order to find the area of ​​an arbitrary polygon, we have talked about the cut-and-patch method. In the three-dimensional geometry, in order to study the properties of certain geometric bodies or calculate its volume, we often make up the geometry and make it a familiar geometry. Example 1 (textbook item 17, page 17) The area of ​​one side of the oblique three bobbin is equal to S, and the distance between this side and the side shuttle to which it belongs is equal to a.