here is the question
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circle .....about properties
2012-10-26 6:28 am
回答 (1)
2012-10-26 9:01 am
✔ 最佳答案
連 AD 及 BC。弧AD = 弧BC(已知)
AD = BC (等弧對等弦)
∠MAD = ∠MBC (對同弧圓周角)
∠AMD = ∠BMC (對頂角)
ΔAMD º ΔBMC (SAA)
AM = BM 及 MC = MD (全等三角形對應邊)
所以 AM + MC = BM + MD
AC = BD
所以 AC = BD = 13cm
參考: 土扁
收錄日期: 2021-04-13 19:04:56
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20121025000051KK00578