在解答立体几何问题时 ,若能把立体几何问题转化为空间向量的运算 ,解答起来省时省力 .向量法充分体现了数形结合思想 ,淡化了传统立体几何中从“形”到“形”的推理方法 ,降低了思维难度 ,使解题过程简捷 ,形象直观 ,学生易于操作 ,容易接受 .下面谈谈用空间向量求空间角的方 When solving the problem of three-dimensional geometry, if we can transform the three-dimensional geometric problem into the operation of the space vector, it will save time and effort to solve it. The vector method fully embodies the idea of ​​combination of numbers and shapes, and weakens the traditional shape from “shape” to “shape.” The reasoning method reduces the difficulty of thinking, makes the problem-solving process simple and intuitive, the image is intuitive, the students are easy to operate, and is easy to accept. Now let’s talk about using space vectors to find the angle of space