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A 20 cm long cylinder is cut into two small cylinders of the same size, and the surface area is increased by 40 cm square. What is the volume of the original cylinder?
If two cylinders are cut off, there will be four bottom surfaces. If two bottom surfaces are added, the area of each bottom surface will be 20cm square, and the volume v = 20x20 = 400cm cubic
If the height of a cylinder is 8 cm and the surface area is 40 π cm square, the diameter of the bottom surface of the cylinder is 0
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