Final answer:
The volume of a cylinder with a radius of 3 feet and a height of 12 feet is calculated using the formula V = πr²h, which results in 339.12 cubic feet, making option A the correct answer.
Step-by-step explanation:
To find the volume of a cylinder, we use the formula V = πr²h, where V is the volume, r is the radius, and h is the height of the cylinder. Using the given radius (r = 3 feet) and height (h = 12 feet), and using 3.14 for π, we calculate the volume as follows:
V = 3.14 × (3 feet)² × 12 feet = 3.14 × 9 feet² × 12 feet = 339.12 cubic feet
Therefore, the correct answer is A) 339.12 cubic feet.