As follows:
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maths~~~~~~~~
2010-01-24 7:38 am
回答 (1)
2010-01-24 7:46 am
✔ 最佳答案
DCB=FED=BAF=60 , so DE=x/tan60 = x/sqrt3 and FB=x/sin60= 2x/sqrt3
CE=CD+DE=FB+DE=x/sqrt3 + 2x/sqrt3=3x/sqrt3=xsqrt3 //
so l = x*sqrt3
收錄日期: 2021-04-23 20:41:39
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100123000051KK01867