F.7 PM (circle)
2010-11-09 6:18 am
Prove that the chord of contact of tangents from a point P passes through a point Q(outside the circle), then the chord of contact of tangents from Q passes through P.
回答 (1)
2010-11-09 7:21 am
✔ 最佳答案
===========================================================圖片參考：http://img594.imageshack.us/img594/4183/11577781.png
2010-11-08 23:22:06 補充：
http://img594.imageshack.us/img594/4183/11577781.png
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https://hk.answers.yahoo.com/question/index?qid=20101108000051KK01618