In the process of deriving the cylinder formula, the surface area of the rectangle is 20 cm larger than that of the cylinder. What is the side area of the cylinder?

The product of the bottom radius of the cylinder multiplied by the height is: RH = 20 / 2 = 10 square centimeter
Therefore, the side area of the cylinder is: 2 Π RH = 2 * 3.14 * 10 = 62.8 square centimeters

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