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Take a piece of 18.84 cm long and 12.56 cm wide paper and circle it into a cylinder. The maximum area of the cylinder bottom is______ ．
18.84 △ 3.14 △ 2 = 3 (CM); 3.14 × 32 = 3.14 × 9 = 28.26 (square cm); answer: the maximum area of the bottom of the cylinder is 28.26 square cm. So the answer is: 28.26 square cm
With a piece of 12.56 cm long, 9.42 cm wide rectangular paper were rolled into two different cylindrical paper cylinder, not counting the joint, their bottom areas are
How many?
When the circumference of the bottom is 12.56 cm, the bottom radius is 12.56 △ 3.14 △ 2 = 2 cm, and the bottom area is 3.14 × 2 × 2 = 12.56 square cm. When the circumference of the bottom is 9.42 cm, the bottom radius is 9.42 △ 3.14 △ 2 = 1.5 cm, and the bottom area is 3.14 × 1.5 × 1.5 = 7.065 square cm
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