As shown in the figure, after a cylinder is cut off 5cm, the surface area of the cylinder is reduced by 31.4cm2

Bottom circumference: 31.4 △ 5 = 6.28 (CM), bottom radius: 6.28 △ 3.14 △ 2 = 1 (CM), two bottom areas: 3.14 × 12 × 2 = 6.28 (cm 2), side area: 6.28 × 20 = 125.6 (cm 2), surface area: 125.6 + 6.28 = 131.88 (cm 2). Answer: the surface area of the original cylinder is 131.88 cm 2

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