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九年级数学上册第23章图形的相似23.2相似图形授课课件（新版）华东师大版.ppt

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华师版九年级数学上册,分组进行测量，探究：（1）在这两个四边形中，是否有对应相等的内角？（2）在这两个四边形中，夹角相等内角的两边是否成比例？,各角分别相等、各边成比例的两个多边形叫做相似多边形.在上图中，四边形ABCD与四边形ABCD相似，记作四边形ABCD四边形ABCD，“”读作“相似于”.,相似多边形对应边的比叫做相似比.,相似比为1时，相似的两个图形有什么关系？,相似比为1时，相似的两个图形全等，因此全等形是一种特殊的相似形.,

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