Question 80260
To find the capacity in gallons, you first must find the volume of the cylindrical tank by using the following formula:
{{{v = .7854*d^2*h}}}
where "d" equals the tank diameter, and "h" equals the height.

In order to use the formula properly, convert both the diameter and height into inches so you are working with the same units.

8 feet 8 inches = 104 inches ("d")
12 feet = 144 inches ("h")

substitute these values into the formula:

{{{v = .7854*(104^2)*(144)}}}
{{{v = .7854*(10816)*(144)}}}
{{{v = 1223263.642}}}{{{in^3)}}}

Next, convert to gallons:
{{{1 US gallon = 231}}}{{{in^3}}}

so, {{{1223263.642/231}}}={{{5295.5136}}}{{{gallons}}}