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图形的相似是几何中的重要内容,在学习这部分内容时,有些同学由于概念不清、考虑不周、方法不当等原因,解题时常会出现一些错误.现将常见错误归类剖析如下.一、图形相似的概念不清例1下列四组图形中,一定相似的是().A.正方形与矩形B.正方形与菱形C.菱形与菱形D.正五边形与正五边形错解:菱形与菱形一定相似,选C.剖析:根据相似图形的定义和性质,两个多边形相似,则一定满足对应角相等,对应边成比例,这两点缺一不可.在两个不同的菱形中,对应边成比例,但
Similar to the geometry of the graphic is an important part of this part of the content in the study, some students due to unclear concepts, ill-considered, improper methods and other reasons, there will always be some mistakes in the problem-solving. First, the concept of similar graphics unclear Example 1 The following four groups of graphics, certain similarities () A. Square and rectangular B. Square and diamond C. Diamond and diamond D. Regular pentagon and regular pentagon Misconstrued: diamond and diamond must be similar to the election C. Analysis: According to the definition and nature of similar graphics, the two polygons are similar, it must meet the corresponding angle equal to the corresponding side is proportional to these two indispensable in two different In the rhombus, the corresponding side is proportional, but