SOLUTION: When a large circular tablecloth has a strip 10cm wide cut from around the edge, the area is reduced by 4710cm^2 What is the radius of the original tablecloth?

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Question 1145527: When a large circular tablecloth has a strip 10cm wide cut from around the edge, the area is reduced by 4710cm^2 What is the radius of the original tablecloth?
Answer by ikleyn(52781) About Me  (Show Source):
You can put this solution on YOUR website!
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pi%2Ar%5E2+-+pi%2A%28r-10%29%5E2 = 4710


r^2 - (r-10)^2 = 4710/3.14

r^2 - r^2 + 2r - 100 = 4710/3.14


2r = 4710/3.14 + 100


r = %281%2F2%29%2A%284710%2F3.14%2B100%29 = 800 cm = 8 meters.    ANSWER