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空间问题求解的实质是通过作辅助面、线、体完成空间向平面的转化.为此,如何添加辅助元(线、面、体)已成为求解空间问题的关键.本文就添加辅助元的成因探讨如下.1 由平面的基本性质诱发添加辅助元平面的基本性质是确定平面的条件,它为添加辅助线、辅助面提供了依据和方法.利用公理2和平面几何知识添加辅助线、补棱找二面角的平面角已成为高考命题的热点.
The essence of the solution of the space problem is to complete the transformation from space to plane by auxiliary planes, lines, and bodies. For this reason, how to add auxiliary elements (lines, surfaces, and bodies) has become the key to solving space problems. This paper will add the causes of auxiliary elements. The discussion is as follows.1 The basic property of adding the auxiliary element plane induced by the basic properties of the plane is to determine the conditions of the plane. It provides the basis and method for adding auxiliary lines and auxiliary surfaces. Using Axiom 2 and plane geometry knowledge to add auxiliary lines and complementary edges Finding the dihedral plane angle has become a hot spot for the college entrance examination proposition.