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九年级数学上册第23章图形的相似23.1成比例线段2平分线分线段成比例授课课件（新版）华东师大版.ppt

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九年级数学上册第23章图形的相似23.1成比例线段2平分线分线段成比例授课课件（新版）华东师大版.ppt_第1页
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华师版九年级数学上册,如图，一组等距离的平行线截直线a所得的线段相等，那么在直线b上所截的线段有什么关系呢？,这里我们所讨论的是平行线截直线相等的情况，那么如果截的线段不相等又会怎样呢？,（1）归纳：平行线分线段成比例定理：三条平行线截两条直线，所得的对应线段的比相等；,（2）推论：平行于三角形一边的直线截其他两边（或两边的延长线），所得的对应线段的比相等；,（3）其他成比例的线段还有哪些？,

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