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求二面角的大小是历年高考的重点和热点.解题的关键是如何作出二面角的平面角.本文综述这类问题的各种解法,供复习参考.一、直接法图形中已有二面角的平面角,只要加以认定(证明),然后计算即可.
The size of the dihedral angle is the focus and hotspot of the college entrance examination over the years. The key to solving the problem is how to make the planar angle of the dihedral angle. This article reviews the various solutions to this type of problem for review purposes. The plane angle of the dihedral angle is determined (prove) and then calculated.