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You need to find the volume of the pool first. It will then tell you how many gallons you need. Here's the formula - 4/3 * 3.14 * radius * cubed Definitions - radius = half of the measurement across the middle of the pool (so measure the length of the pool strait across then divide by 2) - cubed - multiply the answer from the equation - 4/3 * pi * radius -times itself 3 times - ***'s = multiply That should tell you how much you need!

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Q: What are the calculations to determine how many gallons of water are needed in a round pool?
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