O is the center of the semicircle ABCD and AB= BC. Show that BO//CD.
更新1:
1.Leona@童心‧童夢: 你證明呢個,用o既係咩理由? BC=AB = 弧BC=弧AB = ∠CDB=∠BDA 2.vrigo3: 點解你會話 angle BAO = angle BOA = y ( base angle isos. triangle) 邊個講果個係isos. triangle?
1.Leona@童心‧童夢: 你證明呢個,用o既係咩理由? BC=AB = 弧BC=弧AB = ∠CDB=∠BDA 2.vrigo3: 點解你會話 angle BAO = angle BOA = y ( base angle isos. triangle) 邊個講果個係isos. triangle?
收錄日期: 2021-04-23 17:02:39
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070616000051KK02046