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guan yu san zu ping xing xian de yi ge ding li
Author(s): 
Pages: 29-29
Year: Issue:  4
Journal: ZHONGXUE SHUXUE ZAZHI(CHUZHONG BAN)

Keyword:  平行线定理交点平面直线;
Abstract: 如图1,平面上给定三组平行线,分别是a1//a2,b1//b2,c1//c2,处在不同组的两条直线都是相交的.设a1与b2的交点为A,b1与c2的交点为B,c1与02的交点为C;a2与b1的交点为D,b2与C1的交点为E,Cc2与a1的交点为F,则有如下两个结论:
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