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| Math Central | Quandaries & Queries |
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Question from charlie: I have a tank that is 10 feet in diameter that I want to put floating degreaser in.The rate for the degreaser is 1/2 gallon per square foot of surface water.How do I figure out how many gallons I need? |
Charlie,
The area of a circle is π r2 where r is the radius and π is approximately 3.14159. Thus for your circular surface the area is
π r2 = π 52 = 78.54 square feet.
At 1/2 a gallon per square foot that's
78.54/2 = 39.27 gallons.
Penny
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