謝謝！麵積比s / S =( x - sinx)/(2pi - x + sinx)，與圓半徑 r 無關。

來源: 皆兄弟也於 2011-12-01 22:32:17 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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