



 
Jeff, I answered a similar question a couple of years ago. But for this I would recommend formula (14) on the MathWorld page "CircleIntersection": Plug the numbers r = 482.53 (NOT 482.6) and R = 400 into equation (14). I would then keep guessing different values of d until getting an area as close as desired to 179,271. The alternative would be to use a computer program that numerically solves equations involving inverse cosines and square roots. Chris  


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