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Jan 22 at 6:10 vote accept W.Smith
Jan 22 at 6:09 comment added W.Smith Yes, you're right. Thanks!
Jan 20 at 6:35 comment added Sam Nead Since the annulus is a right cylinder, with area one, its height and circumference must be reciprocal.
Jan 20 at 5:58 comment added W.Smith Isn't the height of the annulus 1?
Jan 19 at 18:42 history answered Sam Nead CC BY-SA 4.0