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A cylindrical birthday cake box has a floor radius of 15cm and a height of 20cm.
1, according to the lateral area calculation of the cylinder, a straight plate of18.84m is required;

2, if you make a common cross knot: 4*20 (height direction material) +2* 15*4 (base+top cover) +2* 15cm (two knots on the bottom) =230cm.

Please leave a little more allowance for the actual materials, which is convenient for operation.

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