Circular Pool Math?
A circular swimming pool has a diameter of 20 feet, and is surrounded by a concrete sidewalk that is 3 feet wide. What is the area of the sidewalk? How much fence is required to enclose the deck?
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 InquizetifLv 78 months agoFavorite Answer
Area circle pi r 2
pi x (13 x 13) = 531 ft2
pi x (10 x 10) = 314 ft2
Sidewalk area is first total minus second total = 217 ft2
Diameter fence = 2 pi r = 2 x 3.1415 x 13 = 81.7 ft
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 ComoLv 78 months ago

Area of pool = 100 π ft²
Area of pool and sidewalk = π x 13² = 169 π ft²
Area of sidewalk = 69π ft²
C = 2π x 10 = 20π ft
Length of fencing required = 20π ft
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 Anonymous8 months ago
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 az_lenderLv 78 months ago
Area of the sidewalk is
pi*(13 ft)^2  pi*(10 ft)^2 = 69 pi ft^2 = about 217 ft^2.
What deck?!? ...the fence needed to enclose the outer edge of the sidewalk would be
2*pi*(13 ft) = about 82 ft but use a calculator.
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