Triangle BAC and BDA are similar.
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they share one angle ABC=DBA, how do you get the second pair of
-翎燕-
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09/17/2012 postreply
08:14:26
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谢谢。我证明了 角BAC=any angles on arc AC, so BAC = BDA。
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09/17/2012 postreply
08:28:31