A rectangle paper of 20cm in length and 12cm in width is used to form a cylinder. The maximum side area of the cylinder is () CM & # 178;
No matter how you encircle it, as long as you don't cut and fold it into a cylinder, its side area will not change, and there will be no maximum or minimum. It is always a rectangular area
20 × 12 = 240 square centimeter
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