己知:經過圓O上的點T的切線和弦AB的廷長線相交於點C
求証:角ATC=角TBC
圖:http://img216.imageshack.us/my.php?image=1dg7.png
收錄日期: 2021-04-12 21:25:35
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070111000051KK03203