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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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