It is the circle reaching out for 62.8 miles from the centre.
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A circle with a radius of 4 miles has a circumference of 25.13 miles.
Radius = 4.068 miles (to 3 dp)
3,963.1676 miles
A circle with a radius of seven miles has an area of ~153.938 square miles.
A sphere with a radius of 4.4 miles has a volume of 356.82 cubic miles.