diameter = 2*radius
circumference = pi*diameter
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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.
Circumference is Pi x Diameter so do Circumference divided by Pi to get the diameter :)
The diameter of Saturn at its equator is 116,464 km and its circumference is about 365,882 km.Saturn's equatorial diameter is 120,536 km, so multiply by pi (approximately 3.1416) to get a circumference of 378,675.9 km. Converting km to miles, 378 675.9 kilometers = 235,298.3 miles== ==
diameter = circumference/pi
Circumference = pi*diameter So diameter = circumference/pi = 1.59 units