回複：回複：回複：回複：求助：誰能幫我一下？

來源: 於 2010-03-28 17:41:40 [舊帖] [給我悄悄話] 本文已被閱讀：次

I'm sorry,but you're not right.If h=r A should be pie*r*r/2. Your formula A=r*r