我们知道,在立体几何中有三类角非常重要,它们分别是异面直线所成的角、直线与平面所成的角、平面与平面所成的角。它们是学习的难点,高考的热点,记忆的重点。在此,我们进行归纳,希望能对同学们的学习有所帮助。一、异面直线所成的角——线线角 We know that there are three types of angles in the three-dimensional geometry that are very important. They are the angle formed by the straight lines of different sides, the angle made by the straight line and the plane, and the angle made by the plane and the plane. They are the difficulty of learning, the hot spot of the college entrance examination, and the focus of memory. Here, we summarize and hope to help students learn. First, the angle formed by the different straight lines - line angle