SOLUTION: one circular table has a diameter of 9ft and another circular table has a diamter of 20ft. how much greater is the larger table

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Question 579958: one circular table has a diameter of 9ft and another circular table has a diamter of 20ft. how much greater is the larger table

Answer by Alan3354(69443) About Me  (Show Source):
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one circular table has a diameter of 9ft and another circular table has a diamter of 20ft. how much greater is the larger table
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How much greater what?
Circumference = pi*d
C9 = 9pi
C20 = 20pi
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Area+=+pi%2Ar%5E2
A9 = 81pi/4 = 20.25 sq ft
A20 = 100pi sq ft
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The area of the 20ft is (20/9)^2 times the area of the 9 ft.
The difference in area = 100pi - 20.25pi = 79.75pi sq ft