(1)已知圆的直径为1cm,则这个圆的周长为( )cm.(2)已知圆的半径为1cm,则这个圆的周长为( )cm.(3) 已知圆的直径为3dm则这个圆的周长为( )dm.(4) 已知圆的半径为4dm,则这个圆的周长为( )dm .
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![(1)已知圆的直径为1cm,则这个圆的周长为( )cm.(2)已知圆的半径为1cm,则这个圆的周长为( )cm.(3) 已知圆的直径为3dm则这个圆的周长为( )dm.(4) 已知圆的半径为4dm,则这个圆的周长为( )dm .](/uploads/image/z/1329124-4-4.jpg?t=%281%29%E5%B7%B2%E7%9F%A5%E5%9C%86%E7%9A%84%E7%9B%B4%E5%BE%84%E4%B8%BA1cm%2C%E5%88%99%E8%BF%99%E4%B8%AA%E5%9C%86%E7%9A%84%E5%91%A8%E9%95%BF%E4%B8%BA%EF%BC%88+%EF%BC%89cm.%282%29%E5%B7%B2%E7%9F%A5%E5%9C%86%E7%9A%84%E5%8D%8A%E5%BE%84%E4%B8%BA1cm%2C%E5%88%99%E8%BF%99%E4%B8%AA%E5%9C%86%E7%9A%84%E5%91%A8%E9%95%BF%E4%B8%BA%EF%BC%88+%EF%BC%89cm.%283%29+%E5%B7%B2%E7%9F%A5%E5%9C%86%E7%9A%84%E7%9B%B4%E5%BE%84%E4%B8%BA3dm%E5%88%99%E8%BF%99%E4%B8%AA%E5%9C%86%E7%9A%84%E5%91%A8%E9%95%BF%E4%B8%BA%EF%BC%88+%EF%BC%89dm.%284%29+%E5%B7%B2%E7%9F%A5%E5%9C%86%E7%9A%84%E5%8D%8A%E5%BE%84%E4%B8%BA4dm%2C%E5%88%99%E8%BF%99%E4%B8%AA%E5%9C%86%E7%9A%84%E5%91%A8%E9%95%BF%E4%B8%BA%EF%BC%88+%EF%BC%89dm+.)
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