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Old 07-26-2007   #3
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You know that the area of the field is 7857.143sq ft. This means that the area you want the goat to be able to eat on is half of that, or 3928.571 sq ft. Know that A= πR²You can simply solve3928.571 = πR²√(3928.571/π) = RR = 35.3624 feet