求夹角问题是立体几何中的重点,也是难点。用传统的几何方法计算夹角,要找出夹角,再进行计算。找出这个角在计算上也有一定难度。空间向量作为新内容引入高中数学,在处理空间问题中具有相当的优越性、灵活性。 Angle is the angle between the three-dimensional geometry in the focus, but also difficult. Calculate the angle with the traditional geometric method, to find the angle, then calculate. Find this corner in the calculation there is a certain degree of difficulty. As a new content, the introduction of space vector into high school mathematics has considerable superiority and flexibility in dealing with the issue of space.