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在解答数学题的过程中,往往需要巧妙的引入一个或几个辅助元素,如何确定辅助元素的个数?这要根据问题中图形的约束元素的个数而定。能确定图形的大小形状的元素称为它的约束元素,例如三角形的三条边或两边夹一角或两角夹一边都是三角形的约束元素,三角形有三个约束元素。在解题时若引入辅助元素而辅助元素的个数要和图形的约束元素相等,
In the process of solving mathematical problems, it is often necessary to introduce one or more auxiliary elements in a subtle manner. How to determine the number of auxiliary elements depends on the number of constraint elements in the problem. The element that can determine the size and shape of a graphic is called its constraint element. For example, if the triangle has three edges or two sides, one corner or two corners sandwich the triangle, the triangle has three constraint elements. When introducing problem elements, the number of auxiliary elements must equal the constraint element of the graph.