He knew how to solve the problem.

He posted the same problem in this forum in early 2010

所有跟帖： 

• hehe...Here is the link. I am lucky on this:) -nj_guy- ♂ (108 bytes) () 11/15/2011 postreply 12:17:12

• wow！你行啊！你这水平俺媳妇有没有受点益？ --子女教育-- ♀ (0 bytes) () 11/15/2011 postreply 12:19:43

• BeLe solved that problem too... -nj_guy- ♂ (126 bytes) () 11/15/2011 postreply 12:22:27

• 你们俩都是牛人！所以那天 --子女教育-- ♀ (41 bytes) () 11/15/2011 postreply 12:27:46

• 牛人们，请问：用Law of sine或cosine 怎样做? -xyz- ♀ (0 bytes) () 11/15/2011 postreply 13:58:56