Roll a piece of 18.84*12.56 rectangular paper into a cylindrical paper tube. If you want to match it with a bottom, how many centimeters can the diameter of the bottom be?
将一张18.84*12.56长方形纸卷成一个圆柱形纸筒，若要给它配上一个底面，底面的直径不可能是多少厘米
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