两个平面相交是两个平面的一种很重要的位置关系,有关两个相交平面的交线问题是立体几何的一个重要内容,其应用也很广泛.为此本文对它进行解读,供读者参考.一、关于两个平面的交线的定义若两个平面有一条公共直线,则这两个平面相交,这条公共直线叫做这两个平面的交线.二、画两个平面交线的理论依据 The intersection of two planes is a very important position relationship between two planes. The intersection problem of the two intersecting planes is an important part of the three-dimensional geometry and its application is also very wide. For this reason, this article interprets it for readers A, on the definition of the intersection of two planes If the two planes have a common straight line, then the two planes intersect, this common straight line is called the intersection of these two planes. The theoretical basis