@Randy Dandy,
Randy Dandy wrote:I am unsure how to calculate A.
Assume the tank is capped on both ends. You need total area.
2 caps (pi)(6 squared)x2 = 72 pi
cylinder (pi)x12x14= 168pi
Total area = 240pi
Weight= (240pi)x.25x4.538 ounces
In the real world, if you actually had to weld up this project according to specs, the thickness would be extremely important. The inside/outside diameter of the tank affects the dimensions of the caps. (If inside radius is 6", then outside radius is 6.25")