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相似图形是日常生活中常见的图形.数学中相似关系的研究,是现实生活和生产实际的需要.就是把它们抽象成为图形之间的相似关系,并研究相似形的定义、性质、判定和应用,使之上升为理论,反过来又为实践服务.在研究三角形的全等,即“形状相同,大小相等”的基础上,现要进一步研究两个平面图形的“形状相同,大小可以不一样”的图形的性质——相似.全等和相似是平面几何中研究直线形性质的两个重要方面,全等形是相似比为1的特殊相似
Similar graphics are common graphics in daily life. The study of similarities in mathematics is the need of real life and production. It is to abstract them into similar relations between graphics and to study the definition, nature, judgment and application of similar shapes. , make it rise to the theory, and in turn serve the practice. In the study of the congruence of the triangle, that is, “the shape is the same and the size is the same”, it is now necessary to further study the two plane graphics “the same shape, the size can be different ”The nature of the graphs - similarity. Congruence and similarity are two important aspects of the study of linear properties in plane geometry, and the isomorphism is a special similarity with a similarity ratio of 1.