請幫解國二數一題 3qq
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國中數學1題
2014-04-29 8:08 am
回答 (9)
2014-04-29 1:14 pm
✔ 最佳答案
在AC上取AE=AB => EC=DE設x=∠B=∠AED => ∠C=120-x∠CDE=外角∠AED-∠C=x-(120-x)=2x-120=∠C........EC=ED=120-x=> 3x=240x=80(deg)......ans2014-04-29 06:44:22 補充：
補充:
AB=AE, AD=AD, ∠BAD=∠CAD=30(deg) => ΔABD≡ΔACD
=> BD=DE=EC, ∠B=∠AED=x
2014-06-21 8:26 am
2014-06-05 1:38 pm
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2014-04-29 9:00 am
收錄日期: 2021-04-30 18:50:39
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20140429000015KK00037