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The Watchdog (Posted on 2004-10-28) Difficulty: 5 of 5
A watchdog is tied to the outside wall of a round building 20 feet in diameter. If the dog's chain is long enough to wind half way around the building, how large an area can the watchdog patrol?

See The Solution Submitted by Erik O.    
Rating: 3.4000 (5 votes)

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Why Red Zone? | Comment 9 of 29 |
If this is as easy as the previous comments seem to indicate, then why does this problem have a difficulty level of 5? Perhaps the region of the dog's travel is less straightforward than has been assumed so far?
  Posted by Richard on 2004-10-28 17:38:11
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