A rectangular food box, 20cm in length, 15cm in width and 30cm in height. If a circle of brand paper is pasted around it (not pasted above and below), how many square centimeters is the area of this brand paper at least?

(20 × 30 + 15 × 30) × 2 = (600 + 450) × 2 = 1050 × 2 = 2100 (square centimeter) answer: the area of this brand paper should be at least 2100 square centimeter

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