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Washington DC 3rd Class Boiler Practice Test

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What is the volume of a cylindrical tank that has a 60 inch diameter and a 72 inch length?
Correct Answer:
203575.68 cubic inches
Explanation:
Volume of a cylinder is found with V = π r^2 h. The diameter is 60 inches, so the radius is 30 inches. The length given is the height, 72 inches. Compute r^2 = 30^2 = 900, then 900 × 72 = 64,800. Multiply by π: 64,800 × π ≈ 203,575.68 cubic inches (using π ≈ 3.1416). So the tank’s volume is about 203,575.68 cubic inches.

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