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回复：回复：求助：谁能帮我一下？
jinjing
2010-03-28 11:25:13
( reads)
A is not an angle.
跟帖(3)
sinsin01
2010-03-28 11:57:41
回复：回复：回复：求助：谁能帮我一下？
jinjing
2010-03-28 17:41:40
回复：回复：回复：回复：求助：谁能帮我一下？
jinjing
2010-03-28 19:25:50
I am wrong taking A as circlar sector
sinsin01
2010-03-28 11:57:41回复：回复：回复：求助：谁能帮我一下？