已知四边形ABCD中，E、F、G、H分别是AB、BC、CD、DA边的中点，求证四边形EFGH是平行四边形。
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fb apps(2):mid-pt theorem
2011-03-24 5:58 am
回答 (1)
2011-03-24 6:25 am
✔ 最佳答案
Join AC, then by mid-point theorem, HG//ACAlso EF//AC =>HG//EFJoin BD, by mid-point theorem, EH//BD Also and FG//BD =>EH//FGHence EFGH is a parallelogram
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110323000051KK01270