空间向量是我们解决立体几何的一个很好工具。立体几何中的所有问题都可以用向量解决。以下我就空间角的问题讲一讲向量的解决方法。当题目中具备建系条件时,可建立空间直角坐标系,将线线角、线面角、面面角转化为两向量的夹角从而求解。一、异面直线所成角。设两直线l_1,l_2的 Spatial vectors are a great tool for solving solid geometry. All the problems in solid geometry can be solved by vectors. Below I will talk about the issue of space angle vector solution. When the subject has the conditions of the establishment of the system, the system can create a rectangular coordinate system, the line angle, line angle, surface angle into two vector angle to solve. First, the difference between a straight line into an angle. Set two straight lines l_1, l_2