what is the exact circumference of a circle with an area of 144 times pi square feet

Area=pi times r^2

circumference=2pi times r

we are given

area=144pi ft^2

therefor

area=pi r^2

144pi=pir^2

divide both sides by pi

144=r^2

squre root both sides

12=r

subsitute

circunference=2pi r

circunference=2 times pi times 12

circumference=24pi

answer is 24pi ft

if you were to aprox pi to 3.14 and multiply you would get 75.36 ft