Area of a circle given perimeter

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Mathematics

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 1: When the diameter of the city is 3 miles wide 

Area = pi X r^2 = 3 X (1.5) ^2 = 3X2.25 = 6.75 square miles (pi rounded to 3 as mentioned in question)


2: when the diameter of the city is 6 miles wide 

radius = 3 miles

Area = pi X r^2= 3 X 3^2 = 27 square miles

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