High School

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A circular swimming pool is 17.8 ft in diameter and 3.4 ft deep. Determine the volume, \( v \), of the pool in gallons if one gallon is 231 cubic inches. Round the answer to the nearest integer.

a) 1926 gal
b) 2124 gal
c) 2375 gal
d) 2609 gal

Answer :

Final answer:

To calculate the volume of the pool, we use the formula for the volume of a cylinder, convert the result to cubic inches, and then convert to gallons. The final answer, rounded to the nearest integer, is 6671 gallons.

Explanation:

The student wants to find the volume of a circular swimming pool in gallons. Firstly, we calculate the pool's volume in cubic feet using the formula for the volume of a cylinder V = πr2h, where r is the radius and h is the depth. The diameter of the pool is 17.8 feet, so the radius is half of that, which is 8.9 feet. Plugging in the values, we get V = π(8.92)(3.4). Calculating this gives a volume in cubic feet. We then convert this volume to cubic inches by multiplying by 1728 (since 1 cubic foot is 1728 cubic inches). Finally, we divide by 231 to convert from cubic inches to gallons, as 1 gallon is equivalent to 231 cubic inches.

Now performing the calculations: The volume in cubic feet is approximately V = π(8.92)(3.4) ≈ 891.5 cubic feet. To convert to cubic inches, multiply by 1728 to get 891.5 * 1728 ≈ 1541172 cubic inches. Finally, to convert to gallons, divide by 231 to get 1541172 / 231 ≈ 6671.3 gallons, which we round to the nearest integer, giving us a final answer of 6671 gallons.

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