Let's start with what we know.
Height (h) = 50ft
Diameter (d) = 70ft
1ft³ = 7.5 gallons
To answer this, we first need to know the equation used to calculate the volume of a cylinder:
V = πr²h
Looking at that equation, you might notice it requires the radius (r) while we only have the diameter. Fortunately, the radius is simply one-half of the diameter so:
d/2 = r
70ft/2 = r
r = 35ft
Now that we know r, we can calculate the volume of the tank:
V = πr²h
V = π x (35)² x (50)
V = π x 1225 x 50
V = π x 61250
V ≈ 192422.6 ft³ when you round to the nearest tenth
So now we know this tank's volume is 192,422.6ft³
Since 1ft³ = 7.5 gallons, we can multiply 7.5 by the volume to see how much gas it can hold.
7.5 x 192422.6 = 1,443,165 gallons of gasoline
