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Planet Mars has a mass of 639 x 1021 kilograms (639,000,000,000,000,000,000,000kg)
diameter = 2*radiuscircumference = pi*diameterThe equatorial diameter of Mars is about 6792 km, and its equatorial circumference is about 21,339 km.
Mars is almost a sphere and the volume of a sphere is: 4/3*pi*radius3 So find its radius and its volume can be found using the above formula
I suggest you assume it is a sphere, look up its diameter, and multiply that by pi. That should be close enough.
The mean distances are:Mercury: 5.79*10^7 km Venus: 1.082*10^8 km Earth: 1.469*10^8 km Mars: 2.279*10^8 km Jupiter: 7.786*10^8 km Saturn: 1.4335*10^9 km Uranus: 2.8752*10^9 km Neptune: 4.4951*10^9 km