Xiao Hong takes a rectangular piece of paper, 20 cm in length and 3 / 5 in width, and uses it to form a cylinder. What is the volume of the cylinder?
There are two cases when length and width are used as the bottom respectively: (1) if 20 is used as the bottom circle, the bottom area is 100 / 3.14, then v = 1200 / 3.14. (2) if 12 is used as the bottom circle, then the bottom area is 36 / 3.14, and v = 36 * 20 / 3.14
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