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The equatorial radius 3,396.2 kilometers (2,110miles).The equatorial circumference of Mars is 21,339 kilometers (13,259 miles).Compared to Earth, the ratio is .533, i.e. the radius and circumference of Mars is about half the radius and circumference of Earth.
24,901 miles
The Earth is about 24900 miles around at the Equator.
The official accepted diameter of the earth at the equator is 7,926 miles.That makes the equatorial circumference (7,926 pi) = 24,900.263 miles (rounded)
Jupiter has an equatorial circumference of 439,263.8 kilometers or about 279,118 miles.