1.In the figure, O is the centre of the circle and OB 垂直線 AC. Show that AB = AC.
圖:http://hk.myblog.yahoo.com/Felix-Wong9426/photo?pid=5&fid=2
收錄日期: 2021-04-12 20:30:53
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070524000051KK02704