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圖片參考：http://img684.imageshack.us/img684/9319/vector2y.jpg
vectors(2)
2011-09-23 6:24 am
回答 (1)
2011-09-23 8:08 am
✔ 最佳答案
BC=2BFBD=2BE
CD=BD-BC
=2BE-2BF
=2(BE-BF)
=2FE
By similar argument:
AD=2AH
AC=2AG
CD=AD-AC
=2AH-2AG
=2(AH-AG)
=2GH
2FE=2GH
FE=GH
FE=GH and FE//GH
Therefore EFGH is a parallelogram.
收錄日期: 2021-04-20 11:31:20
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110922000051KK00847