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中学数学中有很多经典几何模型教材、著作、期刊资料、教辅资料,以及中、高考数学乃至竞赛数学中经久不衰.这些模型往往承载了许多重要的数学知识,富于变化而蕴含多样的数学思想方法,它们为研究数学和培养学生的探究能力和创新精神提供了好素材.比如三角形的外展形或内展形模型就是其中一例.下面,我们介绍三角形的几类外展形和内展形,并以此为背景添加一些辅
There are many classical mathematical model in high school mathematics textbooks, books, periodicals, supplementary materials, as well as in mathematics, mathematics and college entrance examination mathematics and enduring .These models often carry a number of important mathematical knowledge, varied and contains a variety of Mathematical thinking methods that provide good material for studying mathematics and developing students’ abilities to explore and innovate.Thus, for example, the outreach or invader model of a triangle is one example.Next, we introduce some types of outreach and interior Show shape, and use this as a background to add some auxiliary