在立体几何中学习锥体和台体时 ,经常会遇到锥体 (或台体 )平行底面截面的问题 .如已知锥体 (或台体 )的高被平行于底面的截面分成的比 ,求各截面的面积或它的侧面积、体积被截面分成的各部分的比 ,或者相反的一类问题 .在现行教材中 ,一般都用棱锥平行底面的截面性质 :“如果? When studying cones and table bodies in solid geometry, the problem of the parallel bottom section of the cone (or table) is often encountered. For example, the ratio of the height of the known pyramid (or table) divided by the section parallel to the bottom is divided. , find the area of ​​each section or its side area, the ratio of the parts whose volume is divided into sections, or vice versa. In the current teaching materials, the cross-section nature of pyramidal bottom surfaces is generally used: “If?