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li yong gong di san jiao xing qiao jie zhong kao mian ji zui da wen ti
Author(s): 
Pages: 62-63
Year: Issue:  4
Journal: ZHONGXUE SHUXUE ZAZHI(CHUZHONG BAN)

Abstract: “共底”三角形的构造
  如图1,在△ABC中,直线MN经过点A,交BC于点D,过点B、C分别作MN的垂线,垂足分别是 E、F.则△ABD 和△ACD构成“共底”三角形。

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