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It is circumference, for a circular orbit
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)
Circumference = 2pi*r Circumference = 86pi
circumference = 24.5
circumference of the tire.