To find the volume of a cylindrical tank, you can use the formula:
\[ V = \pi r^2 h \]
where \(V\) is the volume, \(r\) is the radius, and \(h\) is the height (or length) of the cylinder.
Given:
- Radius \(r = 4\) feet
- Height \(h = 50\) feet
Now, plug in the values into the formula:
\[ V = \pi (4)^2 (50) \]
Now, calculate \( (4)^2 \):
\[ (4)^2 = 16 \]
So, now we have:
\[ V = \pi (16) (50) \]
Now, multiply \(16\) by \(50\):
\[ 16 \times 50 = 800 \]
Now substitute back into the volume formula:
\[ V = 800\pi \]
Thus, the volume of fuel inside the tank is:
\[ \boxed{800\pi} \]