借助于平面的法向量,可以解决立体几何中的许多问题.下面举例说明用法向量求二面角的大小. 要求二面角α-α-β的大小,可以改求平面α和平面β的法向量的夹角θ,若二面角为 With the help of the plane normal vector, many problems in the three-dimensional geometry can be solved. Here is an example of how to calculate the dihedral angle of the usage vector. Requires the size of the dihedral angle α-α-β, you can change the method of the plane α and plane β The angle θ of the vector, if the dihedral angle is