1、用一张长31.4厘米,宽20厘米的长方形的纸围成一个圆柱体,这张纸的长就是圆柱体的( ),宽是圆柱体的( ).2、一个圆柱体的侧面展开是一个边长是8cm的正方形.这个圆柱的侧面积是( )cm2
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![1、用一张长31.4厘米,宽20厘米的长方形的纸围成一个圆柱体,这张纸的长就是圆柱体的( ),宽是圆柱体的( ).2、一个圆柱体的侧面展开是一个边长是8cm的正方形.这个圆柱的侧面积是( )cm2](/uploads/image/z/3003966-54-6.jpg?t=1%E3%80%81%E7%94%A8%E4%B8%80%E5%BC%A0%E9%95%BF31.4%E5%8E%98%E7%B1%B3%2C%E5%AE%BD20%E5%8E%98%E7%B1%B3%E7%9A%84%E9%95%BF%E6%96%B9%E5%BD%A2%E7%9A%84%E7%BA%B8%E5%9B%B4%E6%88%90%E4%B8%80%E4%B8%AA%E5%9C%86%E6%9F%B1%E4%BD%93%2C%E8%BF%99%E5%BC%A0%E7%BA%B8%E7%9A%84%E9%95%BF%E5%B0%B1%E6%98%AF%E5%9C%86%E6%9F%B1%E4%BD%93%E7%9A%84%EF%BC%88+%EF%BC%89%2C%E5%AE%BD%E6%98%AF%E5%9C%86%E6%9F%B1%E4%BD%93%E7%9A%84%EF%BC%88+%EF%BC%89.2%E3%80%81%E4%B8%80%E4%B8%AA%E5%9C%86%E6%9F%B1%E4%BD%93%E7%9A%84%E4%BE%A7%E9%9D%A2%E5%B1%95%E5%BC%80%E6%98%AF%E4%B8%80%E4%B8%AA%E8%BE%B9%E9%95%BF%E6%98%AF8cm%E7%9A%84%E6%AD%A3%E6%96%B9%E5%BD%A2.%E8%BF%99%E4%B8%AA%E5%9C%86%E6%9F%B1%E7%9A%84%E4%BE%A7%E9%9D%A2%E7%A7%AF%E6%98%AF%EF%BC%88+%EF%BC%89cm2)
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