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Monthly Archives for June, 2013



Four legged stool on uneven floor

Posted on: June 1st, 2013 by
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Suppose you place a four-legged square stool (with equal length legs) on an uneven floor. Obviously it will wobble. However, if you rotate the stool by at most 90 degrees, there will always exist a point where all the four legs touch the floor at the same time. Thus the wobbling stops. Prove the claim. via Guardian (SPOILER ALERT)

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