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空间中角的概念 ,包括异面直线所成的角 ,直线和平面所成的角和二面角 .1 异面直线所成的角根据异面直线所成角的定义 ,平移其中的一条使之和另一条相交 ,就可以得到异面直线所成的角 .而平移通常是以作平行线的方法来达到这一目的 .图 1 例 1图例 1 ( 1989年北京高一竞赛
The concept of the angle in the space, including the angle formed by the straight lines and the angles and dihedral angles formed by the straight line and the plane.1 The angle formed by the straight lines on the opposite side translates one of them according to the definition of the angle formed by the straight line on the opposite side. The intersection with the other one can obtain the angle formed by the straight lines on the opposite side. The translation is usually done by the parallel line method to achieve this purpose. Fig. 1 Example 1 Legend 1 (Beijing Gaoyi Contest of 1989)