题目来源
题目来源1 : Cracking
正确率：76%
难度：3
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A piece of ribbon is wrapped around a right circular cylinder with radius n. The ribbon, which encircles the cylinder without overlap, has width x and an area equal to the area of the base of the cylinder.
Quantity A
x
Quantity B
n
B显示答案
以上解析由 考满分老师提供。
