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关于求二面角平面角的问题在传统立几中处理的方法较多,而且也是高考的一个重要内容,但在新教材中对此有所淡化,只要求学生能用平面法向量求出二面角平面角的大小.两法向量的夹角与二面角的平面角到底何时相等何时互补,教材中处理得比较含糊,要求借助于图形直观解决,此法可操作性实际上并不大,因此许多学生包括部分老师到了这个部分便有种说不清的感觉.
There are many ways to solve the problem of dihedral angle, but it is also an important part of the college entrance examination. However, it has been diluted in the new teaching materials. Only students can use the plane normal vector to find two The size of the plane angle of plane angle. The angle between the two normal vectors and dihedral angle when the plane angle when exactly equal when the teaching material handling more ambiguous, requires the use of graphical intuitive solution, this method operability and Not many, so many students, including some teachers in this part will have a kind of indefinable feeling.