To find the volume of fuel inside a cylindrical tanker, you can use the formula for the volume of a cylinder, which is given by:
\[ V = \pi r^2 h \]
where:
- \( V \) is the volume,
- \( r \) is the radius,
- \( h \) is the height (or length, in the case of a horizontal cylinder).
For this problem, the radius \( r \) is 4 feet and the length \( h \) is 50 feet.
Plugging in the values:
\[ V = \pi (4)^2 (50) \]
Calculating \( (4)^2 \):
\[ (4)^2 = 16 \]
Now substitute this back into the volume formula:
\[ V = \pi (16)(50) \]
Now, multiply \( 16 \) by \( 50 \):
\[ 16 \times 50 = 800 \]
Thus, the volume of the fuel in the tank is:
\[ V = 800\pi \]
So, the answer is \( 800\pi \).