A circular oil spill has a radius of 2 miles. After a day, the radius of the oil spill increases by 3 miles. By how many square miles does the area of the oil spill increase? Round to the nearest thousand, if necessary
"A_1=\\pi2^2=4\\pi sq.mi."
"A_2=\\pi(2+3)^2=25\\pi sq.mi."
"A_2-A_1=25\\pi-4\\pi=21\\pi\\approx 65.973 sq.mi."
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