回复：回复：回复：回复：求助：谁能帮我一下？
jinjing
2010-03-28 17:41:40
( reads)
I'm sorry,but you're not right.If h=r A should be pie*r*r/2. Your formula A=r*r
I'm sorry,but you're not right.If h=r A should be pie*r*r/2. Your formula A=r*r