Answer:
240.56 ft³,384.895 ft²
Step-by-step explanation:
15 inches = 1.25 feet where 1 inch = 0.0833 feet
volume of the air duct = volume of a cylinder = πr²h
volume of the air duct = 3.142 × ( 1.25 ft)² × 49 ft = 240.56 ft³
the exterior of the duct = curved surface area of a cylinder = 2πrh = 2 × 3.142 × 1.25 ft × 49 ft = 384.895 ft²
