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义务教育教材中所指位似图形都是封闭的,通常位似比都不等于1.那么问题来了:有没有开放性的位似图形呢?有没有位似比等于1的位似呢?答案都是肯定的.1判定依据观点1《近代欧氏几何学》第2章《相似形》[1].定理1:设点O及图形ABC…为已知,将每条线段OA,OB,OC,…分成比为k,分点为A’,B’,C’,…,则图形A’B’C’…与图形ABC…相似,对应边互相平行.
Compulsory education textbooks refer to the bit-like graphics are closed, the bit is usually equal to the ratio is not equal to 1. So the question is: there is no open bit-like graphics? There is no bit like bit equal to 1 like? The answer is in the affirmative .1 Judgment is based on point 1: “Similarity” in Chapter 2 of “Modern Euclidean Geometry.” Theorem 1: Set point O and graph ABC ... are known. Each line segment OA, OB , OC, ... are divided into k and the points are A ’, B’, C ’, ..., the figure A’B’C’ ... is similar to the figure ABC ... and the corresponding edges are parallel to each other.