Since the volume of a cylinder is V = (pi*radius^2)*height,
then, rearranging, radius = square root (V / (pi*height)).
Plug the numbers in and find out!
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3.4 miles is 17952ft r2 = 4400/17952pi r= 0.28 ft
A sphere with a radius of 4.4 miles has a volume of 356.82 cubic miles.
For the volume of pipes, you can use the formula for a cylinder.
A circle with a radius of 4 miles has a circumference of 25.13 miles.
Radius = 4.068 miles (to 3 dp)