1.两个圆半径的比是1:3,它们的周长的比是( ).A.1:3 B.3:1 C.1:92.一个圆的周长是2PAI(符号不知道怎么打)r厘米,这个圆的直径是( )CM.A.2PAI B.2R C.PAIr D.无方确定3.一个半圆的半径是3CM,这个半圆的周长
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![1.两个圆半径的比是1:3,它们的周长的比是( ).A.1:3 B.3:1 C.1:92.一个圆的周长是2PAI(符号不知道怎么打)r厘米,这个圆的直径是( )CM.A.2PAI B.2R C.PAIr D.无方确定3.一个半圆的半径是3CM,这个半圆的周长](/uploads/image/z/3896648-8-8.jpg?t=1.%E4%B8%A4%E4%B8%AA%E5%9C%86%E5%8D%8A%E5%BE%84%E7%9A%84%E6%AF%94%E6%98%AF1%3A3%2C%E5%AE%83%E4%BB%AC%E7%9A%84%E5%91%A8%E9%95%BF%E7%9A%84%E6%AF%94%E6%98%AF%28+%EF%BC%89.A.1%3A3+B.3%3A1+C.1%3A92.%E4%B8%80%E4%B8%AA%E5%9C%86%E7%9A%84%E5%91%A8%E9%95%BF%E6%98%AF2PAI%28%E7%AC%A6%E5%8F%B7%E4%B8%8D%E7%9F%A5%E9%81%93%E6%80%8E%E4%B9%88%E6%89%93%29r%E5%8E%98%E7%B1%B3%2C%E8%BF%99%E4%B8%AA%E5%9C%86%E7%9A%84%E7%9B%B4%E5%BE%84%E6%98%AF%28+%29CM.A.2PAI+B.2R+C.PAIr+D.%E6%97%A0%E6%96%B9%E7%A1%AE%E5%AE%9A3.%E4%B8%80%E4%B8%AA%E5%8D%8A%E5%9C%86%E7%9A%84%E5%8D%8A%E5%BE%84%E6%98%AF3CM%2C%E8%BF%99%E4%B8%AA%E5%8D%8A%E5%9C%86%E7%9A%84%E5%91%A8%E9%95%BF)
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