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Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 投票中
正九邊形有幾條對稱軸
May 17th 2013, 08:46

9條喔
只要是"正"的 不管正幾邊形
他的邊數=對稱軸喔 ^^

1平方公里=10000公畝
里( )頃( )畝( )尺( )吋( )分( )厘
數字和括號都各佔一單位
把數字1寫在"里"的下面 後面補0到公畝那裡
～～~里( )頃( )畝( )尺( )吋( )分( )厘
這樣= 1 0 0 0 0
1平方公里=10000公畝
這樣就簡單許多啦 ^^ 希望有幫助到你 ^^

參考資料： 自己

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