For a circular tank: Area (A) = π (3.14) x diameter squared (D²) / divided by 4 Volume (V) = A x H Capacity (C) = V x 7.48 gal/ft³
A = [π x (D²)/4]
V = A x H
C = V x 7.48
We Find the capacity of a circular tank with a diameter of
15 ft and a height of 12 ft:
A = [3.14 x (15 ft²)/4] = 177 ft²
V = 177 ft² x 12 ft =2,120 ft³
C = 2,120 ft³ x 7.48 gal/ft³ = 15,900 gal
The capacity in gallons of a circular tank can also be written as one formula:
C gal = (π x D²)/4 x H x 7.48
= (3.14 x 15 ft²)/4 x 12 ft x 7.48 gal/ft
= 15,900 gal
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