直经1200卷管创星cf1200安装视频多少钱一吨

一卷纸的直径是1200,中心纸管是80的,用50的纸管再复卷一遍,它的直径会是多少,有没有公式,..一卷纸的直径是1200,中心纸管是80的,用50的纸管再复卷一遍,它的直径会是多少,有没有公式,请您详细告知,
孤单圣诞树4b5c
这个基本上就是一个两个环形第一个内圈80,外圈1200另一个内圈50两个环形面积相等,求第二个的外圈直径大概是 1198.37
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