A radius is not a specific unit of measurement. Therefore, the two units are incompatible.
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Do you mean the length of such an orbit ?Well . . .-- The radius of the Earth is about 3,960 miles.-- 220 miles further out means that the radius of the orbit is 4,180 miles.-- The circumference of a circle is (2 pi) x (the radius).-- So the length of the orbit is (8,360 pi) = 26,264 miles. (rounded)
A circle with a radius of 4 miles has a circumference of 25.13 miles.
A 15 mile radius implies 30 miles across.
Radius = 4.068 miles (to 3 dp)
3,963.1676 miles