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Answer:

Step-by-step explanation:

V=πr^2h

r = ?

V = 144π ft^3

h = 9 ft

π(r^2)*9 = 144π divide both sides by π

(r^2)*9 = 144

by solving we find and consider the positive root (the radius can not be a negative number)

r = 4 ft

The radius is 4 feet.

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