If the height of a cylinder is increased by 3 cm, the side area will be increased by 18.84 square cm. What is the bottom area of the cylinder______ ．

The radius of this cylinder is: 18.84 △ 3 △ 3.14 △ 2 = 1 (CM), the bottom area of this cylinder is: 3.14 × 12 = 3.14 (square cm); answer: the bottom area of this cylinder is 3.14 square cm. So the answer is: 3.14 square cm

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