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Puzzles: Circular argument

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Circular argument 

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I have a 1 foot diameter hoop that I use to mark out circular 1 foot diameter plots in the garden. How can I use the same hoop to mark out plots 2 feet in diameter?
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Content Type: Discussion
Created at 08/09/2010 01:46 PM  by John Rowland 
Last modified at 21/05/2013 10:19 AM  by John Rowland