rectangular carton, the bottom surface is a square with a side length of 20cm, and a height of 40cm. Put a wrapping paper around the carton. What is the minimum size of the wrapping paper? (connectors not counted)
一个长方形纸盒，底面是边长的20cm的正方形，高40cm，给纸盒四周贴一圈包装纸，最少要多大的包装纸？(接头不计)
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